Part of speech: Noun
the trait of acting stupidly or rashly
Categories: Trait
Part of speech: Noun
the quality of being rash and foolish
Example: trying to drive through a blizzard is the height of folly; adjusting to an insane society is total foolishness
Categories: Stupidity
Part of speech: Noun
foolish or senseless behavior
Categories: Play, Frolic, Romp, Gambol, Caper
Unwiseness, Foolery, Lunacy, Betise, Craziness
The word "folly" comes from Old French folie.
The Norman Conquest of 1066 brought thousands of French words into English overnight.