Meta-Ethics

Meta-ethics asks what moral judgements mean, whether anything makes them true and how moral knowledge would be possible. These are related but non-identical questions. A semantic theory analyses the function and meaning of “wrong”. A metaphysical theory asks whether moral properties or facts exist. An epistemic theory explains how an agent could know or justifiably believe a moral claim.

Cognitivism says moral judgements express propositions capable of truth or falsity. It includes naturalism and non-naturalist intuitionism. Non-cognitivism denies that their primary function is factual assertion, treating them as expressions, prescriptions or practical commitments. Cognitivism does not itself prove objectivity: an error theorist can say moral sentences aim at truth but are systematically false. Non-cognitivism does not mean moral language is meaningless: action-guidance and attitude can be highly significant.

A good comparison therefore avoids category mistakes. Moore's claim that goodness is non-natural addresses metaphysics and definition; Ross's appeal to apprehension addresses knowledge; Ayer's emotivism addresses meaning. One can reject Moore's epistemology without proving Ayer, or reject verificationism without proving that naturalism is true. Conclusions become stronger when they state which burden has actually been met.

The source starter asks students to classify claims such as “beer contains alcohol” and “stealing is bad”. Some statements are straightforwardly descriptive; evaluative claims commend, condemn and guide action. Hume's famous observation is that writers move from propositions joined by “is” to a new “ought” relation without explaining the inference.

The point is logical, not the claim that facts never matter. If suffering is bad and an action causes avoidable suffering, the factual premise is essential. The evaluative bridge—suffering is a reason against the action—does normative work. Adding it can make the inference valid, but disagreement may then move to the bridge. Hume asks that this step be made explicit.

A naturalist may argue that some evaluative truths are grounded in flourishing or reasons that natural facts reveal. A non-cognitivist may say the bridge expresses a practical stance rather than reports an extra property. The debate is not settled by finding an “ought” in the conclusion. It concerns whether the necessary evaluative premise is true, what could justify it and whether its practical force is best explained by belief or attitude.

Ethical naturalism holds that moral reality is part of the natural world rather than a separate non-natural realm. The simplest version defines good as a natural feature such as pleasure. More sophisticated versions need not claim the words are synonymous. They may argue that moral properties are identical with, realised by or grounded in natural properties, much as an informative scientific identity can connect differently understood terms.

Reduction promises explanatory continuity. Evidence about suffering, need, agency or flourishing can make moral claims answerable to public inquiry. It also explains causal relevance: natural conditions influence action and experience. The danger is choosing a favoured natural property and calling it good without sufficient argument. Happiness, desire-satisfaction and evolutionary fitness can conflict, and each can occur in morally troubling forms.

A high-level critique therefore targets the exact version. Moore's open question strongly challenges an analytic definition: even after learning that an act maximises pleasure, a competent speaker can still ask whether it is good. That does not automatically refute an a posteriori identity or a grounding theory. The naturalist must explain normativity—why the property supplies reasons—while the non-naturalist must explain knowledge and causal connection.

G. E. Moore compares “good” with a simple quality such as yellow. Complex things can be defined by their parts; a simple quality cannot be analysed into more basic components for someone who lacks the concept. His conclusion is not merely that natural things can be bad. It is that goodness itself cannot be defined as any natural or metaphysical property without confusing the property that is good with goodness.

The open-question argument asks whether, for a proposed definition such as “good means pleasant”, it remains a substantive question whether every pleasant thing is good. If the question remains intelligible rather than tautological, the terms do not have the same meaning. The naturalistic fallacy is Moore's charge that a theory identifies the simple property good with some other property. It should not be reduced to the elementary slogan “natural does not equal good”.

Three criticisms follow. The argument may establish only a difference in concept, not a difference in property. It may rely on competent speakers' intuitions about openness, which can lag behind theoretical discovery. Finally, Moore's alternative needs an epistemology: if goodness is simple and non-natural, what makes intuition reliable? His analysis blocks a quick reduction but does not by itself prove the entire intuitionist picture.

A useful distinction separates two accounts of intuition. On one model, intuition is an immediate intellectual apprehension of a self-evident proposition, different from sensation, feeling or a conclusion inferred through argument. On another, an intuition is a firmly held, non-inferred conviction that supplies the starting data for ethical reflection.

The apprehension model offers direct access to truth but risks mystery. What is the faculty, and why do equally sincere people seem to apprehend incompatible principles? The conviction model is psychologically familiar and allows critical comparison, but inherited prejudice can also feel immediate. Singer's genealogical challenge is that many intuitions may reflect discarded religious, sexual or survival norms rather than independent insight.

Defenders can adopt a fallibilist method. Self-evidence does not mean obvious at first glance or immune to error; it may require conceptual competence, maturity and reflection. Convictions can be revised for coherence, factual accuracy and freedom from bias. Critics reply that this begins to resemble reflective equilibrium rather than direct intuition. The dispute concerns whether reflection discovers moral truth or only systematises our strongest starting attitudes.

W. D. Ross identifies duties of fidelity, reparation, gratitude, justice, beneficence, self-improvement and non-maleficence. A prima facie duty is a genuine moral reason that binds unless outweighed in the circumstances; it is not a merely apparent duty. The actual duty is what the agent should do after all relevant prima facie reasons are considered.

This pluralism explains why moral conflict is not always reducible to one metric. Keeping a promise, preventing injury and correcting injustice can each matter in its own right. It also preserves moral remainder: a justified breach of promise may still call for regret or reparation because the defeated reason does not become unreal.

The theory's difficulty is ranking. Ross denies a mechanical formula and appeals to mature judgement. That fits the complexity of moral life but can make disagreement hard to resolve. Why this list, and why trust the convictions of “thoughtful and well-educated” people when education can reproduce social privilege? A defender points to convergence, coherence and practical wisdom; a critic asks for a more independent truth test.

Meta-ethical labels answer different questions and should not be treated as one line from objective to subjective. Semantics asks what a moral sentence means and whether it expresses a proposition. Metaphysics asks what, if anything, makes that proposition true. Epistemology asks how a person could know it. Moral psychology asks how judgement connects with motivation. A theory can be cognitivist about meaning yet sceptical about truth, as error theory is; it can be realist about truth yet admit uncertainty about knowledge.

Cognitivism says sincere moral assertions normally present something as true. It does not by itself guarantee that any assertion succeeds. Realism adds that at least some moral claims are true in a way not constituted merely by an individual's or group's approval. Objectivism is often used for this independence, but needs a specified contrast: independence from current desire, culture, ideal observers or every possible response. Non-cognitivists instead analyse moral speech primarily through attitudes, prescriptions or plans, while sophisticated versions explain why it can still resemble factual discourse.

This map improves examination argument. When someone cites disagreement, ask what the evidence is meant to show. It might challenge moral knowledge, suggest response-dependence or support a theory of meaning, but those conclusions require different bridges. When a naturalist identifies goodness with flourishing, ask whether the claim concerns the meaning of the word, the property picked out by it or the evidence used to discover it. A precise essay evaluates one bridge at a time and then considers whether a complete theory can make its semantic, metaphysical and motivational parts cohere.

Hume observes that writers move from statements about what is or is not the case to conclusions framed by ought or ought not without explaining the new relation. The challenge is logical: a conclusion containing a normative commitment does not follow from purely descriptive premises unless some evaluative bridge is supplied. From the fact that an action causes pain, one cannot deduce that it is wrong without a premise about pain, interests or reasons. Adding that premise may produce a valid argument, but the meta-ethical question then moves to its status and justification.

This point is sometimes confused with Hume's wider account of moral sentiment. Hume does not infer that moral discussion is meaningless or that every feeling is equally authoritative. Human beings share capacities for sympathy and can correct a narrow personal standpoint by considering character and consequence from a more general view. Reason discovers facts and relations, while sentiment supplies approval and disapproval. The result is neither simple rationalism nor an instruction to follow the strongest current emotion.

Naturalists can accept the logical gap while arguing that some bridge principles are supported by what human practices are for, what agents necessarily value or what flourishing consists in. Non-naturalists can treat the bridge as a basic moral truth. Non-cognitivists may interpret it as a commitment made in prescribing. The enduring value of Hume's challenge is diagnostic: it forces the hidden evaluative premise into view. It does not choose among those explanations, and it does not show that facts are irrelevant once a normative standard has been defended.

An analytic naturalist claims that moral terms can be analysed through natural concepts, perhaps desire satisfaction, welfare or the properties approved under ideal conditions. Moore's open-question argument attacks simple definitions: even after learning that an act maximises pleasure, a competent speaker can intelligibly ask whether it is good. If the terms were identical by meaning, the question might seem closed in the way that asking whether an unmarried man is a bachelor is closed once the definitions are understood.

A synthetic naturalist can concede that moral and natural expressions differ in meaning while claiming that they identify the same property. Water and its chemical constitution provide the familiar structural analogy: an identity may be discovered rather than true by definition. The open question would then show conceptual difference, not metaphysical separation. Ethical inquiry might discover that moral facts are higher-level natural facts about needs, cooperation or flourishing, although the analogy is incomplete because moral investigation lacks one agreed experimental method and includes an action-guiding dimension.

Moore still creates a burden. The naturalist must explain why the chosen natural property, rather than a rival, deserves the moral role and how the identity accounts for reasons to act. Merely placing the word natural before welfare proves nothing. Conversely, the persistent intelligibility of a question does not by itself prove that two properties differ; speakers can remain ignorant of a true identity. The best judgement is that the open-question argument defeats crude dictionary reductions more decisively than every naturalist metaphysics.

Moral judgement displays a consistency constraint often described as supervenience. If two situations are identical in every relevant natural respect, it seems incoherent to call one right and the other wrong without identifying a difference. A change in moral status must be accompanied by some change in intention, consequence, relationship, promise, need or other underlying feature. Hare uses a related thought in universalising prescriptions: a person cannot prescribe differently in a relevantly similar case simply because the identities have swapped.

Naturalists argue that this dependence fits their view. If moral properties are constituted by or realised in natural facts, no moral difference can float free of them. Yet supervenience alone does not establish identity. A non-natural realist can say that moral properties necessarily depend on natural arrangements without being reducible to them, just as one higher-level description may track a lower-level base without sharing its vocabulary. The challenge is to explain the necessity rather than merely announce it.

The principle also disciplines applied reasoning. A student who condemns one deception but permits a structurally similar deception must state the morally relevant difference. However, relevance is itself normative. Consequences, motives and commitments may all change, and theories disagree over their weight. Supervenience supplies a formal demand for consistent reasons; it does not generate the substantive rule. Its importance lies in showing why moral language can be logically constrained even before realism has been settled.

J. L. Mackie accepts that ordinary moral judgements present themselves as claims about objective requirements. He therefore does not translate wrong into a cheer, command or report of private taste. His sceptical conclusion is that such claims systematically fail because there are no objective values of the kind ordinary discourse presupposes. Error theory is consequently cognitivist about meaning and anti-realist about truth. This combination proves why cognitivism must not be used as a synonym for moral realism.

The view faces a practical choice. One response is abolition: stop asserting claims that presuppose properties which do not exist. A fictionalist may retain moral language as a useful practice without literal belief, while a revisionist can reconstruct it through natural interests, agreements or attitudes. Each route must explain why the language continues to guide action and blame without misleading speakers. If ordinary people do not actually presuppose the robust objectivity Mackie rejects, the error diagnosis may also be too sweeping.

Error theory gains force from parsimony and from explaining disagreement without a special faculty of moral perception. Its cost is equally large: apparently secure claims against cruelty or betrayal become untrue in their ordinary objective form. The realist can reply that a theory which declares every considered moral judgement false needs stronger evidence than the existence of disagreement. The evaluative contest is not between comfort and courage; it is whether realist commitments carry explanatory work that justifies them or add an unnecessary metaphysical layer.

Mackie's argument from queerness claims that objective values would be unlike ordinary properties because they would contain an authoritative reason or demand for action. Recognising wrongness would not merely describe an event but count decisively against choosing it. The metaphysical challenge asks what kind of property could possess this built-in practical authority. The epistemological challenge asks what faculty would detect it and how that faculty could be checked when intuition conflicts.

Realists have several replies. First, normative reasons need not push a person causally in the way a force moves an object; they count in favour of action and can be ignored by an irrational or indifferent agent. Secondly, mathematics, modality and epistemic norms also appear non-empirical yet play indispensable roles. If all reasoning already presupposes standards about what one ought to believe, rejecting moral normativity for being normative may be selective. These companions-in-guilt arguments do not prove moral realism, but challenge the claim that its ontology is uniquely strange.

Naturalist realism avoids some metaphysical distance by locating moral properties within the natural world, but must still explain practical authority. Intuitionism directly accepts non-natural properties and needs an account of disciplined access. Non-cognitivism explains direction through attitudes or plans and therefore avoids a magnetic property, yet must reconstruct truth-like moral reasoning. A good assessment evaluates the explanatory bill of every theory: removing objective value saves one kind of entity but may require a more complex account of logic, disagreement and commitment.

Persistent moral disagreement can suggest that judgements express culture or attitude rather than track independent fact. Different societies teach different expectations, and individuals often rationalise interests. If an objective moral property were plainly accessible, convergence might be expected. Singer's criticism of inherited intuitions intensifies the problem: convictions may preserve the needs of an earlier social order rather than deliver timeless knowledge. This evidence should reduce confidence in unexamined intuition.

However, disagreement is compatible with truth. People lack facts, emphasise different cases, use different concepts or reason under unequal power. Disputes in science and history do not show that those subjects lack truth conditions. Moral disagreement also occurs against a background of shared concerns about harm, reciprocity, loyalty and justification, even when their interpretation differs. Some apparent disputes concern non-moral facts, while some apparent agreement hides different reasons.

The strongest anti-realist argument therefore needs a genealogy explaining why the disputed belief arose and why that process is not truth-sensitive. The realist must then show a method of correction: broader evidence, impartial comparison, coherence and attention to excluded perspectives. Disagreement is epistemically significant because it calls for humility and error-checking. It becomes a metaphysical refutation only if every plausible realist explanation of convergence, correction and persistent difficulty fails.

Evolution and social learning help explain why humans quickly respond to kin, reciprocity, threat and coalition. A debunking argument says that if moral intuitions were selected for survival or group coordination rather than truth, their agreement with independent moral facts would be accidental. The point is not that an evolved belief must be false. Vision is evolved and often reliable. The challenge is whether the causal process would have produced the same moral response regardless of truth.

A realist can distinguish basic capacities from corrected judgement. Evolution may supply sympathy, aversion and the ability to reason, while reflective enquiry revises their partial outputs. Mathematics also uses evolved cognitive resources for questions far removed from ancestral selection. A naturalist may go further: if moral facts concern flourishing and cooperation, selection for navigating social life could create some truth-sensitive access. The strength of that answer depends on not defining truth simply as whatever dispositions evolution produced.

Non-cognitivists can incorporate the genealogy directly: moral language organises shared plans and attitudes built from human concerns. Yet they still need standards for criticising inherited cruelty or exclusion rather than recording the attitudes that survived. Debunking works locally when it reveals a specific bias and an available correction. As a global argument it risks undermining the evaluative judgement that truth-tracking is preferable to adaptive illusion. The best conclusion is that genealogy tests warrant more reliably than it settles ontology.

Internalism claims a necessary or reliable connection between sincere moral judgement and motivation. If a person genuinely judges an act wrong yet feels no motivation whatsoever to avoid it, an internalist may suspect that the person has not made a full moral judgement. This fits non-cognitivism: approving, prescribing or planning normally has practical direction built in. It also reflects ordinary criticism of someone who recites a duty while remaining entirely untouched by it.

Externalists separate belief from desire. A person can believe that an action is wrong but lack motivation because of depression, exhaustion, indifference or a competing desire. The figure of the amoralist is conceptually possible: someone understands the moral facts but simply asks why they should care. Realists may prefer this separation because ordinary factual belief does not automatically motivate. They can explain action through a moral belief combined with a standing desire to do what is right.

Neither side should rely on labels alone. Strong internalism struggles with weakness of will and psychological impairment; unrestricted externalism may fail to capture the action-guiding role central to moral discourse. A moderate position connects judgement with motivation under conditions of practical rationality, while allowing interference. This debate matters when evaluating Ayer and Hare. Explaining motivation is a strength of attitude- and prescription-based accounts, but an account must also explain sincere conflict, apathy and how reasons can criticise the motivations a speaker happens to possess.

A. J. Ayer applies the verification principle: a synthetic proposition is factually meaningful only if experience could verify it at least in principle, while analytic truths depend on definitions or logic. Moral properties are not empirically observable, and moral judgements are not analytic. Ayer therefore denies that adding “wrong” to a description states an additional fact.

On his account, “stealing is wrong” expresses disapproval rather like a horrified tone and can also provoke similar feeling. This explains motivation and why moral language differs from detached reporting. It also appears to explain persistent disagreement where parties share facts but hold opposed attitudes.

The cost is severe. Moral reasoning seems able to expose inconsistency, error and better evidence. If judgement merely expresses attitude, what distinguishes rational improvement from successful persuasion? The verification principle itself is neither straightforwardly analytic nor empirically verifiable, creating a self-application problem. Rejecting that principle removes Ayer's main route to emotivism, although a separate expressivist theory may survive.

C. L. Stevenson agrees that ethical language has emotive meaning but offers a richer model than “boo/hurrah”. Moral terms have a tendency, built through use, to evoke attitudes. Ethical judgement also has a dynamic purpose: speakers seek to alter or intensify the hearer's interests. Praise, blame and rhetoric can propagate attitudes through a community without physical force.

Stevenson allows a descriptive component. Disagreement can concern beliefs about consequences as well as a deeper disagreement in attitude. Reasons matter when changing a factual belief is likely to change the attitude: evidence that a policy causes suffering can resolve conflict if both parties already oppose suffering. Where ultimate attitudes differ, reasoning may reach a limit and persuasive definition becomes important.

This accounts for the magnetic and practical character of moral words. Critics worry that it assimilates moral argument to influence and cannot distinguish education from manipulation. A defender can say that exposing descriptive error is genuinely rational even if final attitudes are not truth-apt. The remaining question is whether consistency and informed reflection create objective practical standards or only more stable preferences.

R. M. Hare treats moral judgements as universal prescriptions. Saying an act is wrong commits the speaker to prescribing against relevantly similar acts, including cases where the speaker occupies another person's position. The view is non-cognitivist because prescription is not description, yet it gives moral language a logical structure.

Universalisability disciplines prejudice. An agent cannot condemn a practice only when harmed by it while approving the same relevant features when advantaged. Prescriptivity connects judgement to action: sincerely making the judgement commits the speaker to a practical stance. Facts determine which cases are relevantly similar, so information and imagination matter.

The objection is that a consistent fanatic may universalise an abhorrent prescription and accept its application to themselves. Hare can require full information and vivid representation of everyone's preferences, moving towards preference utilitarianism. Critics ask whether that result comes from logic alone or from substantive assumptions about impartial identification. Prescriptivism shows why moral argument is more than emotion, but may not secure the truth the cognitivist wants.

W. V. O. Quine provides a useful stretch connection. Logical positivism depends heavily on a distinction between analytic truths, true by meaning, and synthetic truths, answerable to experience. Quine argues that attempts to define analyticity rely on related notions such as synonymy that are no clearer, and that statements meet experience as part of a wider web of belief.

If the boundary is not sharp, Ayer's sorting of meaningful propositions into analytic and empirically verifiable categories loses its clean foundation. Even an apparently definitional truth depends on linguistic and background commitments. This does not make moral claims true, but it weakens the argument that they must be non-cognitive because they fit neither box.

Quine also encourages holism: revision can occur at different points in a belief system when experience conflicts. Applied cautiously, moral beliefs may be assessed through their relations to psychology, social facts, reasons and other commitments rather than one isolated verification test. The risk is overreach. A challenge to analytic/synthetic distinction is not itself a positive moral realism.

A simple emotivist can explain a standalone sentence such as lying is wrong as disapproval of lying. The difficulty appears when the same words occur unasserted: if lying is wrong, encouraging a lie is wrong; lying is wrong; therefore encouraging a lie is wrong. The first occurrence sits inside a conditional and need not express the speaker's present disapproval. Yet the argument is valid because the phrase keeps a stable content across the premises. If its meaning changes between expression and embedding, the inference becomes equivocal.

This is not merely a puzzle about unusual grammar. Moral claims appear in questions, negations, reports of another person's belief and complex plans. Any non-cognitivist theory must explain these constructions while retaining the practical function that distinguished it from cognitivism. Simply adding that speakers have feelings does not supply the logical relations among claims. The problem therefore presses against the thinnest boo-and-hurrah presentation of emotivism.

Later expressivists respond by treating moral judgements as structured practical commitments capable of consistency and implication. Plans can conflict; attitudes can be accepted conditionally; a speaker can reject a combination of commitments. Quasi-realists explain why the resulting discourse legitimately uses truth-like grammar. Critics ask whether so complete a reconstruction has earned the realist's structure while refusing its ontology. The debate is valuable because it changes the criterion of success: a meta-ethical theory must explain whole arguments, not only isolated moral exclamations.

Simon Blackburn's quasi-realism begins from attitudes but seeks to earn the practices associated with realism: calling claims true, treating some judgements as mistaken and reasoning through conditionals. Projection does not mean that speakers consciously paint feelings onto a neutral world. It describes how stable evaluative sensibilities support a discourse in which people demand consistency and criticise attitudes. The project asks how much objective-looking moral practice can be explained without positing stance-independent moral properties.

Allan Gibbard analyses moral judgement through acceptance of norms or plans governing action and feeling. Disagreement is practical incompatibility: two people may accept plans that cannot jointly guide the same situation. Factual information matters because plans are conditional on descriptions of the world. This gives expressivism resources to explain deliberation and the difference between a passing emotion and a considered moral commitment. It also connects moral language with coordination while leaving room for criticism of inconsistent or poorly informed plans.

The realist challenge is one of explanation and stability. If quasi-realism licenses truth, error, objectivity and valid inference, what substantive difference remains? The expressivist answers that the explanation runs from human practical stances to the discourse, not from independently existing moral properties to correct belief. The realist replies that some errors appear possible even if every actual speaker approves. The theories therefore differ over direction of explanation, not over whether careful moral argument occurs. That is a more accurate comparison than saying one side believes in reasoning and the other only in emotion.

Moral enquiry often moves between considered judgements, general principles and relevant non-moral evidence. A conflict can prompt revision at any level: an intuition may reflect prejudice, a principle may be overbroad, or a factual belief may be false. Reflective equilibrium names the search for a coherent arrangement reached after exposing each part to criticism. It resembles Ross's respect for mature convictions but denies that every initial conviction carries equal authority.

The method becomes wider when it compares rival theories, historical explanations and the perspectives of people affected by a rule. This helps answer the objection that intuitionism merely consecrates the outlook of a privileged group. A belief formed under misinformation or self-interest has less evidential weight; a judgement that survives varied cases and informed challenge has more. Nevertheless, coherence can be achieved within more than one starting framework, and a coherent set can still be detached from moral reality.

Realists can treat the method as fallible access to truth, naturalists as theory-building around human goods, and constructivists as part of generating justified principles. Even non-cognitivists can use it to refine commitments. Its cross-theoretical appeal is both strength and limitation: it improves reasoning but does not decide what makes the result true. In an essay about intuition, the best use is modest. Reflective equilibrium converts immediate seeming into revisable evidence, reducing arbitrariness without claiming an infallible moral sense.

People often cite the rejection of slavery, expanded political equality or protection from discrimination as moral progress. The realist may argue that progress makes sense because societies can approach truths they previously ignored. Error is exposed through testimony, consistency and better knowledge, not merely through a change in taste. This captures the conviction that a reforming minority can be right before its society approves.

An anti-realist need not describe every change as arbitrary. Progress can mean greater coherence with deeply held commitments, more informed and inclusive preferences, reduced suffering or norms that could be accepted from multiple perspectives. The difficulty is whether these standards are themselves treated as objectively better. If inclusion is praised only because current speakers favour it, the condemnation of an unanimously oppressive society appears weakened. If inclusion is justified through reasons valid independently of approval, realism may be returning through the standard.

Realists also face a challenge: historical change does not always move in one direction, and confidence in progress can conceal new forms of domination. A credible account needs mechanisms of correction and evidence that the later judgement is better, not simply later. Moral progress therefore supplies abductive support rather than a proof. It favours whichever theory best explains criticism across time, the possibility of collective error and the role of information without turning present consensus into the final court of appeal.

Start with one moral sentence and ask four questions. Is the speaker asserting a proposition? What would make it true? How could the speaker know? What practical commitment follows? Ethical naturalism may identify truth with natural facts; intuitionism treats goodness as non-natural and known through rational apprehension; emotivism highlights expression and influence; prescriptivism treats the claim as a universal direction. The comparison becomes meaningful only when every theory analyses the same sentence in the same context.

Then place the sentence inside disagreement and argument. Can the theory distinguish factual dispute from conflict in attitude? Can it explain logical consistency, changed judgement after evidence, an embedded conditional and a person who judges without acting? Use named objections precisely. Moore targets reductive definitions more clearly than every natural identity; the verification principle burdens Ayer's semantics but does not by itself refute Stevenson's psychology of influence; Quine questions a sharp analytic–synthetic foundation without proving moral realism.

A conclusion should rank explanatory achievements and costs. Realism naturally preserves truth and error but owes an ontology and epistemology. Naturalism integrates ethics with the world but must secure normativity. Intuitionism protects irreducible value but must discipline access. Expressivism explains direction and motivation but reconstructs logic and objectivity. No theory wins because of one slogan. State which features of moral practice are indispensable, why the preferred theory explains them with the fewest serious liabilities, and which residual problem remains.