Synonyms of foolishness

Noun

1. folly, foolishness, unwiseness, trait

usage: the trait of acting stupidly or rashly

2. folly, foolishness, craziness, madness, stupidity

usage: the quality of being rash and foolish; "trying to drive through a blizzard is the height of folly"; "adjusting to an insane society is total foolishness"

3. stupidity, betise, folly, foolishness, imbecility, mistake, error, fault

usage: a stupid mistake