Anti-realism in metaethics rejects the existence of mind-independent moral facts. This umbrella covers emotivism (moral claims express emotions), expressivism (they express attitudes or norms), error theory (they claim to describe facts but systematically fail), and constructivism (they construct meaning relative to rational agents or communities). Anti-realists must explain how moral discourse can guide action and ground responsibility without objective facts backing it.
Compare how a moral statement ('cruelty is wrong') functions with other kinds of statements (factual, expressive, prescriptive) to see which best explains its role in reasoning and action.
Anti-realism doesn't mean morality is arbitrary or that anything goes; many sophisticated anti-realist views defend robust, rationally defensible moral standards grounded in attitudes, procedures, or the structure of agency itself.
From your study of the moral facts and objectivity debate, you know the central question of metaethics: are there objective moral facts that exist independently of what anyone thinks or feels? Moral realism answers yes — moral claims like "cruelty is wrong" describe real features of the world. Moral anti-realism is the family of positions that answers no, and it is broader and more philosophically sophisticated than the caricature of "morality is just opinion." Anti-realism encompasses several distinct views, each denying mind-independent moral facts for different reasons and with different implications for how moral discourse works.
Emotivism, associated with A.J. Ayer, holds that moral claims are not statements at all — they express emotions rather than assert propositions. To say "cruelty is wrong" is to express something like "cruelty — boo!" rather than to describe a fact about cruelty. Emotivism is a form of non-cognitivism: moral utterances are neither true nor false because they are not the kind of thing that can be true or false. Expressivism, developed more carefully by Simon Blackburn and Allan Gibbard, refines this insight: moral claims express attitudes, commitments, or norms rather than describing facts, but these attitudes can be assessed for coherence, consistency, and responsiveness to reasons. Error theory, championed by J.L. Mackie, takes a cognitivist route to anti-realism: moral claims do aim to describe facts, and they are truth-apt — but they are systematically false, because the mind-independent moral facts they presuppose do not exist. Moral discourse is a kind of pervasive fiction. Constructivism, associated with Christine Korsgaard and others, holds that moral claims are made true or false not by mind-independent facts but by the rational commitments of agents or communities — morality is constructed through reason, not discovered in the world.
The most important corrective for understanding anti-realism is that rejecting objective moral facts does not entail that "anything goes." Constructivists ground moral standards in what rational agents would agree to under idealized conditions, or in the structural requirements of any viable social life. Expressivists can distinguish warranted from unwarranted attitudes based on coherence, sensitivity to information, and internal consistency. Even error theorists, who hold that all moral claims are false, can adopt a fictionalist stance — continuing to use moral language because it serves indispensable social functions, while recognizing its metaphysical status. The anti-realist is making a claim about what moral language refers to and what makes moral claims true (or not), not denying that moral reasoning can be done well or poorly.
The challenge for anti-realism is explaining the features of moral discourse that realism handles naturally. Moral disagreement feels like disagreement about facts, not mere clashes of preference. Moral progress — the abolition of slavery, the expansion of rights — seems like progress toward something, not just a change in attitudes. Anti-realists must explain these phenomena without appealing to mind-independent moral facts. The sophistication of contemporary anti-realism lies in its ability to do so: expressivists explain disagreement as clashing plans of action, constructivists explain progress as increasing coherence with the demands of practical reason, and error theorists explain the appearance of objectivity as a useful illusion. Whether these explanations are adequate remains one of the central ongoing debates in metaethics.
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