noun the result of a foolish action or enterprise.
2. folly ·noun scandalous crime; sin; specifically, as applied to a woman, wantonness.
3. folly ·noun the state of being foolish; want of good sense; levity, weakness, or derangement of mind.
4. folly ·noun a foolish act; an inconsiderate or thoughtless procedure; weak or light-minded conduct; foolery.