folly

nouns

the trait of acting stupidly or rashly

folly, foolishness, unwiseness

antonym

a stupid mistake

betise, folly, foolishness, imbecility, stupidity

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"

craziness, folly, foolishness, madness

foolish or senseless behavior

craziness, folly, foolery, indulgence, lunacy, tomfoolery