folly
noun
[ ˈfɒli ]
• lack of good sense; foolishness.
• "an act of sheer folly"
• a costly ornamental building with no practical purpose, especially a tower or mock-Gothic ruin built in a large garden or park.
• a theatrical revue with glamorous female performers.
• "the Ziegfeld Follies"
Origin:
Middle English: from Old French folie ‘madness’, in modern French also ‘delight, favourite dwelling’ (compare with folly (sense 2)), from fol ‘fool, foolish’.
