What Is Moral Nihilism?

Direct Answer

Moral nihilism is the meta-ethical view that objective moral facts do not exist. It holds that statements like "murder is wrong" or "justice is good" are not true or false in the way that empirical statements like "water boils at 100 degrees Celsius" are, because there are no moral properties in the world for these statements to describe. When we make moral judgments, according to the moral nihilist, we are not reporting on an independent moral reality; we are expressing our attitudes, invoking conventions, or making claims that have no objective grounding at all. Nothing, in this view, is intrinsically right or wrong — morality is a human construction without foundation in the fabric of reality.

This is a startling claim, and it is important to distinguish it from several positions with which it is often confused. Moral nihilism is not the same as moral relativism, which holds that moral judgments are true or false relative to the standards of a particular culture or individual. The relativist says "murder is wrong" can be true for one society and false for another; the nihilist says it is not true or false at all, because there is nothing for it to be true or false about. Moral nihilism is also not the same as moral skepticism, which holds that we cannot know whether moral facts exist. The skeptic withholds judgment; the nihilist makes a judgment — that moral facts do not exist.

The strongest and most influential form of moral nihilism in contemporary philosophy is the error theory, developed by J.L. Mackie in his 1977 book Ethics: Inventing Right and Wrong. Mackie's argument is distinctive because it does not deny that we make moral judgments, nor does it deny that these judgments purport to report objective facts. Instead, it accepts that moral discourse has a realist structure — that when people say "murder is wrong," they mean to assert an objective moral fact — and then argues that all such assertions are false, because the objective moral properties they presuppose do not exist. We are systematically in error when we make moral judgments: not because we are wrong about particular cases, but because the entire framework of objective moral fact is an illusion.

Historical Context

The roots of moral nihilism extend deep into the history of philosophy, though the term itself is relatively recent. In the ancient world, the Greek skeptics — particularly Pyrrho and later the Pyrrhonian tradition — argued that we should suspend judgment about all claims, including moral claims, because equally compelling arguments could be made on both sides of any question. This was not moral nihilism in the strict sense, but it did challenge the possibility of objective moral knowledge. The ancient sophists, particularly Thrasymachus in Plato's Republic, argued that justice is nothing but the interest of the stronger — a view that reduces moral claims to expressions of power rather than reports of objective fact.

The modern roots of moral nihilism lie in the scientific revolution and the Enlightenment. As the mechanical picture of the world developed by Newton and others replaced the teleological picture inherited from Aristotle, it became increasingly difficult to find a place for moral facts in the natural order. The physical world as described by science contains facts about masses, velocities, and chemical compositions, but no facts about what is right or wrong, good or evil. If the natural world is all there is, and if the natural world contains no moral properties, then moral claims have no objective grounding — they are projections of human attitudes onto a world that does not contain the properties they describe.

This line of thought was developed most powerfully by Nietzsche in the 19th century. Nietzsche argued that the moral framework of Western civilization — with its distinction between good and evil, its emphasis on compassion and humility, its condemnation of pride and power — was a historical construction, the product of what he called the "slave revolt in morality." The values of the weak had triumphed over the values of the strong, and this triumph had been disguised as the discovery of objective moral truth. In fact, Nietzsche argued, there are no moral facts: "There are altogether no moral facts," he wrote. "Moral judgments agree with religious ones in believing in realities that are no realities."

Nietzsche's contribution was not merely the denial of moral facts but the diagnosis of why we believe in them. The belief in objective moral truth, he argued, serves a psychological and social function: it gives the weak a weapon against the strong, it provides a sense of meaning and purpose in a world that does not contain them, and it allows human beings to avoid confronting the terrifying freedom of a world without moral foundations. Nietzsche's "transvaluation of all values" was not a call to abandon morality but a call to create new values — to replace the inherited moral framework, which he saw as life-denying and decaying, with values that affirm life, power, and creativity.

In the 20th century, the logical positivists developed a different route to moral nihilism. A.J. Ayer, in Language, Truth, and Logic (1936), argued that moral statements are not assertions at all but "emoticons" — expressions of feeling rather than reports of fact. When we say "murder is wrong," we are not making a claim that could be true or false; we are saying "murder!" in a tone of disapproval. This emotivist view was developed by Charles Stevenson into a more sophisticated account of moral language as expressing and evoking attitudes, and it was the dominant form of moral nihilism in mid-20th-century analytic philosophy. Mackie's error theory, published in 1977, represented a shift from the emotivist denial that moral statements have truth value to the more radical claim that moral statements do have truth value but are systematically false.

Philosophical Perspectives

Mackie's Error Theory

Mackie's error theory rests on two arguments. The first is the "argument from relativity," which observes that moral codes vary dramatically across cultures and historical periods. This variation, Mackie argues, is best explained not by the hypothesis that different cultures are tracking the same objective moral reality from different angles, but by the hypothesis that moral codes are human constructions shaped by ways of life, social structures, and psychological needs. If there were objective moral facts, we would expect more convergence; the actual pattern of variation suggests that moral beliefs are projections rather than discoveries.

The second, and more powerful, is the "argument from queerness." If objective moral facts existed, they would be utterly unlike anything else in the natural world. Moral properties would have to be both objective (independent of human attitudes) and intrinsically action-guiding (capable of motivating anyone who apprehends them). But nothing in the natural world has both of these properties. Natural facts — that fire is hot, that sugar is sweet — can be objective, but they do not intrinsically motivate. Desires and attitudes — the desire to avoid pain, the aversion to cruelty — can motivate, but they are not objective in the relevant sense. The combination of objectivity and intrinsic motivational force that moral facts would need to possess is, Mackie argues, metaphysically and epistemologically "queer" — too strange to be believed in.

The error theory is distinctive because it takes moral discourse at face value. Mackie does not argue, as the emotivists did, that moral statements are not really assertions. He agrees that when people say "murder is wrong," they are making a claim that purports to report an objective fact. But he argues that this claim is false, because the objective moral fact it purports to report does not exist. This makes the error theory more radical than emotivism: the emotivist says moral discourse is not what it appears to be (it is not factual assertion), while the error theorist says it is exactly what it appears to be (factual assertion) but that it is systematically mistaken.

Nietzsche and the Genealogy of Morality

Nietzsche's contribution to moral nihilism is different in character from Mackie's. Where Mackie approaches the question as a meta-ethical theorist, asking whether moral facts exist, Nietzsche approaches it as a genealogist, asking how moral beliefs arose and what functions they serve. In On the Genealogy of Morality (1887), Nietzsche traces the history of the concepts of "good" and "evil" from their origins in the distinction between "noble" and "base" to their inversion in the Christian moral framework, in which the qualities of the weak (humility, compassion, meekness) were redefined as virtues and the qualities of the strong (pride, power, ambition) were redefined as vices.

This genealogical analysis is nihilistic in its implications because it reveals that moral values are not discovered but made — and made by particular people in particular circumstances for particular purposes. The moral framework that presents itself as the expression of timeless moral truth is, on Nietzsche's account, the product of a historical power struggle. This does not prove that moral facts do not exist, but it undermines the authority of moral claims by showing their contingent and interested origins. If our moral beliefs are products of a particular history rather than discoveries of objective truth, then their authority is not what they claim to be.

Nietzsche's "transvaluation of all values" (Umwertung aller Werte) is the positive project that follows from this negative analysis. If inherited moral values are life-denying constructions, then the task of philosophy is to create new values — values that affirm life rather than deny it, that celebrate strength rather than condemning it, that embrace the earth rather than fleeing to a transcendent realm. This is not moral nihilism in the sense of the rejection of all values; it is the rejection of inherited values and the call for their replacement with values that are honestly acknowledged as human creations.

Expressivism and the Projectivist Tradition

Contemporary moral nihilism has also been developed through expressivism — the view that moral language does not report facts but expresses attitudes. The most sophisticated contemporary expressivist is Simon Blackburn, whose "quasi-realism" aims to explain how moral discourse can have the structure of factual assertion (with moral statements appearing to be true or false) without requiring the existence of objective moral facts. Blackburn argues that moral discourse is a projective activity: we project our attitudes onto the world and then talk as if the world contained the moral properties we have projected. This does not make moral discourse illegitimate — Blackburn argues that it can be perfectly coherent and useful — but it does mean that moral truths are not truths about an independent moral reality.

This projectivist tradition offers a way of preserving the practice of moral discourse without the metaphysical commitments of moral realism. The quasi-realist can say "murder is wrong" and mean it, while also holding that this statement does not report an objective moral fact but expresses a stance that has been integrated into a stable, coherent system of attitudes. This is a form of moral nihilism that does not feel like nihilism: it allows moral discourse to continue while denying the metaphysical foundations that moral realists claim it requires.

Modern Reflection

Contemporary philosophy continues to debate moral nihilism with great intensity, and the debate has been enriched by several developments. The revival of moral realism, driven by philosophers like Derek Parfit, Thomas Nagel, and Russ Shafer-Landau, has challenged the nihilist assumption that moral facts would have to be "queer" entities. These realists argue that moral facts are not metaphysically anomalous but are analogous to other normative facts — facts about what one has reason to do — that are indispensable to rational thought. If we can have reasons to believe things, they argue, we can have reasons to do things, and the objectivity of practical reason grounds the objectivity of moral claims.

The debate has also been influenced by experimental philosophy, which uses empirical methods to study how ordinary people think about moral questions. Studies have found that people's intuitions about moral objectivity are mixed: some moral claims are treated as objective (like "murder is wrong") while others are treated as relative or subjective (like "it is wrong to eat meat"). This mixed pattern complicates both the realist claim that moral discourse is committed to objectivity and the nihilist claim that ordinary moral judgment presupposes objective moral facts. The empirical data suggests that ordinary moral thought may not have a single, consistent metaphysical structure.

The practical implications of moral nihilism have been a recurring concern. If moral facts do not exist, does it follow that we should abandon moral discourse? Most moral nihilists argue that it does not. Mackie himself argued that we can and should continue to make moral judgments, while being aware that they are not reports of objective facts but expressions of our own values and commitments. The awareness that morality is a human construction does not make it less important — it may make it more important, because it means that moral values are our responsibility, not gifts of nature or divine command that we merely discover and follow.

The existentialist tradition, particularly in the work of Jean-Paul Sartre and Albert Camus, has explored the ethical implications of a world without moral foundations. For Sartre, the absence of objective moral facts means that human beings are "condemned to be free" — we must choose our values without any external authority to guide us, and we bear full responsibility for the choices we make. This is not a cause for despair but for authenticity: the honest acknowledgment that our values are our own creation is the precondition of genuine moral agency. Camus, similarly, argued that the recognition that the world is morally indifferent — that it is "absurd" in the sense of being without inherent meaning or moral order — is the starting point for a life of courage, solidarity, and rebellion against injustice.

Related Thinkers

• Nietzsche — the philosopher who provided the most powerful genealogy of moral values, arguing that they are historical constructions rather than objective discoveries, and who called for the transvaluation of all values as the response to the collapse of the inherited moral framework.
• Karl Marx — whose analysis of ideology as the expression of class interests parallels the nihilist insight that moral claims may serve particular power structures rather than reporting objective truths, and whose thought contributed to the tradition of unmasking moral discourse as a form of social power.

Related Books

• Ethics: Inventing Right and Wrong by J.L. Mackie — the foundational text of the error theory, presenting the arguments from relativity and queerness that remain the most influential case for moral nihilism in contemporary philosophy.
• On the Genealogy of Morality by Friedrich Nietzsche — the genealogical analysis that traces the origins of moral values to power struggles rather than objective discovery, providing the historical and psychological foundations for the nihilist position.

Related Quotes

• "There are altogether no moral facts." — Friedrich Nietzsche
• "Moral judgments are not the expression of objective truth but of human attitudes projected onto the world." — J.L. Mackie (paraphrased)
• "If God does not exist, everything is permitted." — Fyodor Dostoevsky (a formulation that moral nihilism analyzes rather than endorses)
• "We must imagine Sisyphus happy." — Albert Camus (reflecting the existentialist response to a world without objective moral order)

Related Topics

• Knowledge and Truth — Moral nihilism raises fundamental questions about the nature of moral truth: if moral judgments are not true or false, what is the status of moral knowledge, and can we know anything about what is right or wrong?

Further Learning

To deepen your understanding of moral nihilism, explore these connected resources in the ZHAIBIAN archive:

• Morality — the wisdom entry on the nature of moral judgment and moral agency, within which moral nihilism represents the most radical challenge to the objectivity of moral claims
• Nihilism — the wisdom entry on the broader philosophical tradition of nihilism, of which moral nihilism is one specific form, encompassing also existential and epistemological nihilism
• Nietzsche — the thinker profile of the philosopher whose genealogy of morality provided the most influential historical and psychological analysis of how moral values are constructed
• Existentialism — the philosophy entry on the tradition that takes seriously the implications of a world without objective moral foundations and explores the ethical possibilities of freedom and responsibility
• Postmodernism — the philosophy entry on the tradition that extends the nihilist critique of objective truth and moral foundations into a broader questioning of all claims to universal knowledge
• Understanding Reality — the curated collection on how philosophy, science, and wisdom traditions approach the question of what is real and how we can know it