Fōl'ly, n.

noun

n. [Fr. folie, from fol, fou, foolish, mad; Pr. & O. Sp. folia, It. follia. See FOOL.]

Sense 1. The state of being a fool; want of good sense; levity, weakness, or derangement of mind.

Sense 2. A foolish act; an inconsiderate or thoughtless procedure; weak or light-minded conduct; foolery.

What folly 'tis to hazard life for ill. Shak.