the trait of acting stupidly or rashly 同义词:folly, unwiseness
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" 同义词:folly, craziness, madness
Foolishness is the lack or failure of wisdom and of making proper careful choices. In this sense, it differs from stupidity, which is the lack of intelligence.