Main Entry: fol·ly

Pronunciation: \ˈfä-lē\

Function: noun

Inflected Form(s): plural follies

Etymology: Middle English folie, from Anglo-French, from fol fool

Date: 13th century

1 : lack of good sense or normal prudence and foresight
2 a : criminally or tragically foolish actions or conduct b obsolete : evil, wickedness; especially : lewd behavior
3 : a foolish act or idea
4 : an excessively costly or unprofitable undertaking
5 : an often extravagant picturesque building erected to suit a fanciful taste