A lack of self-control or the inability to do what you know you should do, even when you want to.
From Greek akrasia (ἀκρασία), meaning 'lack of self-control,' from a- (not) + kratos (strength, power). The term was popularized by Aristotle to describe the condition where someone acts against their own better judgment.
Aristotle used this word to explain why people eat dessert even when they're on a diet—it's not stupidity, it's weakness of will! This ancient Greek concept is still used by modern psychologists studying self-control.
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