stupidity, foolishness, imbecility, foolery, craziness, tomfoolery, indulgence, unwiseness, betise, foolishment, more...

wisdom, prudence, sense, sagacity, reason

hubris, naivete, arrogance, ignorance, foolishness, recklessness, imprudence, indiscretion, more...

own, such, human, great, sheer, mere, utter, criminal, youthful, extreme, pure

a bad idea,   poor judgement,   poor judgment,   stupid decision,   bad judgement,   foolish act,   stupid actions,   stupid action,   stupid act,   absurd act