Folly - definition of folly by The Free Dictionary
https://www.thefreedictionary.com/folly
WEB1. the state or quality of being foolish; lack of understanding or sense. 2. a foolish action, practice, idea, etc.; absurdity. 3. a costly and foolish undertaking; unwise investment or expenditure. 4. a whimsical or extravagant and often useless structure built to serve as a conversation piece, lend interest to a view, etc.
DA: 40 PA: 80 MOZ Rank: 43