Akrasia
Greek term for weakness of will — acting against one's own better judgement. You know the right thing to do, you sincerely want to do it, and yet you do the other thing anyway (eating the cake, skipping the workout, scrolling instead of working). Discussed by Plato and Aristotle as a puzzle about how reason and desire interact, and revived in modern philosophy of action. "Inverse akrasia" — where weakness of will happens to drive someone toward the morally correct choice against their stated principles — is the classic reading of Huckleberry Finn helping Jim escape.