folly

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fol·ly / ˈfälē/ • n. (pl. -lies) 1. lack of good sense; foolishness: an act of sheer folly. ∎  a foolish act, idea, or practice: the follies of youth.2. a costly ornamental building with no practical purpose, esp. a tower or mock-Gothic ruin built in a large garden or park.3. (Follies) a theatrical revue, typically with glamorous female performers: [in names] the Ziegfeld Follies.

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