- lack of good sense; foolishness；a foolish act, idea, or practice
noun: folly, plural noun: follies
- 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, especially a tower or mock-Gothic ruin built in a large garden or park.
- 3. a theatrical revue with glamorous female performers the Ziegfeld Follies