n. pl. fol·lies 1. Lack of good sense, understanding, or foresight: an act of folly 2. a. An act or instance of foolishness: regretted the follies of his youth. b. A costly undertaking having an absurd or ruinous outcome. 3. follies (used with a sing. or pl. verb) An elaborate theatrical revue consisting of music, dance, and skits. 4. A structure, such as a pavilion in a garden, that is chiefly decorative rather than practical in purpose. [Middle English folie, from Old French, from fol, foolish, from Late Latin follis, windbag, fool; see FOOL.] |
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