What Is Akrasia?

Direct Answer

Akrasia, from the Greek akrasia (literally "lack of mastery"), is the phenomenon of acting against one's own better judgment. The akratic agent judges that some course of action is best, all things considered, and yet acts otherwise. The classic example is the dieter who knows that the dessert will derail her health goals and eats it anyway — not because she changes her mind, but precisely because she cannot get herself to follow her own verdict. The term is commonly translated as "weakness of will" or "incontinence." Akrasia must be distinguished from compulsion (acting under irresistible external force), from ignorance (not knowing the good), and from a mere change of mind (revising one's judgment). The akratic agent continues to endorse the judgment she violates: she knows the better and does the worse while still believing that the better is better.

Historical Context

The problem of akrasia is one of the oldest in moral psychology. In the Protagoras, Socrates famously argued that akrasia is impossible: if someone truly judges that x is best, they will pursue x, since no one errs willingly. Apparent weakness of will, on this view, is really a form of ignorance or misjudgment about the balance of goods. Plato refined the issue in the Republic with his tripartite division of the soul into reason, spirit, and appetite: the parts can conflict, and appetite can drag reason along against its better judgment. Aristotle gave the most influential treatment in the Nicomachean Ethics, distinguishing akrasia from vice. The vicious person acts wrongly with conviction and endorses the wrong; the akratic person acts wrongly against her own conviction and feels regret. Aristotle explained the mechanism through the practical syllogism — a universal premise ("sweet things are pleasant") and a particular premise ("this is sweet") — arguing that appetite can seize the particular premise before reason can apply the universal one, producing action that bypasses the agent's considered judgment.

Key Arguments & Debates

Three debates dominate the literature. First, is akrasia possible at all? The Socratic position denies it, treating apparent akrasia as error in judgment; the Aristotelian position accepts it as a real psychological possibility that any adequate moral psychology must explain. Second, is akratic action irrational? Most philosophers answer yes, because the agent frustrates her own ends. But Donald Davidson argued that akrasia is possible precisely because practical reasoning is holistic: the agent holds one set of reasons supporting the judgment and a conflicting set supporting the action, and in the moment the weaker set wins. Some philosophers, following Davidson, have even defended the possibility of "rational" akrasia, in which acting against one's better judgment is intelligible in context. Third, there is a structural debate about practical reason: do we always act on our strongest desire, as Humean theories hold, making akrasia merely a matter of desire strength? Or can reason issue verdicts that desire then overrides? Empirical psychology — from Walter Mischel's marshmallow experiments to Daniel Kahneman's distinction between fast, automatic System 1 processing and slow, deliberate System 2 reasoning — has reframed akrasia as the tension between hot, impulsive processes and cool, controlled ones.

Contemporary Relevance

Akrasia matters in almost every domain of self-management. Procrastination, failed diets, addiction relapse, and abandoned resolutions are everyday instances of acting against one's better judgment. Philosophy clarifies why willpower training alone is insufficient: if akrasia involves a failure to perceive the particular situation rightly, as Aristotle suggested, then developing practical wisdom — the capacity to see what matters here and now — is as important as strengthening resolve. Psychologists now study ego depletion (the contested idea that self-control is a depletable resource), implementation intentions (if-then plans that automate the moment of choice), and precommitment strategies, from Ulysses binding himself to the mast to modern savings plans. The analysis also bears on moral responsibility: akratic wrongdoing is culpable, but differently from vicious wrongdoing, because the akratic agent affirms the right standard and is vulnerable to genuine regret.

Related Concepts

Akrasia is closely connected to practical wisdom, the intellectual virtue that enables right judgment in particular cases and the remedy for weakness of will. It contrasts with enkrateia, or self-control, the mastery that resists appetite, and it connects to moral character, since the settled dispositions of character make right action reliable rather than effortful. It also touches the unity of the virtues: if full virtue requires the integration of judgment and desire, then akrasia marks a partial failure of character that no isolated trait can fully compensate for.

Further Learning

For deeper study, see the Stanford Encyclopedia of Philosophy entry on "Weakness of Will," the SEP entry on "Aristotle's Ethics," and the SEP entry on "Moral Psychology." Aristotle's own discussion in Book VII of the Nicomachean Ethics remains the classic text, and the SEP bibliography tracks the modern debate from Davidson onward.