Origin: oe. Folie, foli, f. Folie, fr. Fol, fou, foolish, mad. See fool.
1. The state of being foolish; want of good sense; levity, weakness, or derangement of mind.
2. A foolish act; an inconsiderate or thoughtless procedure; weak or light-minded conduct; foolery. What folly 'tis to hazard life for ill. (Shak)
3. Scandalous crime; sin; specifically, as applied to a woman, wantonness. [Achan] wrought folly in Israel. (Josh. Vii. 15) When lovely woman stoops to folly. (Goldsmith)
4. The result of a foolish action or enterprise. It is called this man's or that man's folly, and name of the foolish builder is thus kept alive for long after years. (Trench)