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Folly (n.) The state of being foolish; want of good sense; levity, weakness, or derangement of mind.
Folly (n.) A foolish act; an inconsiderate or thoughtless procedure; weak or light-minded conduct; foolery.
Folly (n.) Scandalous crime; sin; specifically, as applied to a woman, wantonness.
Folly (n.) The result of a foolish action or enterprise.