Stupid, idiotic, witless, mindless, imprudent, irresponsible, indiscreet, unintelligent, ill-advised, impolitic, reckless, lunatic, senseless, nonsensical, fatuous, laughable, derisible, dim, dopey, half-baked, crackbrained, wooden-headed, nutty, crazy, cuckoo, wacky, daft, batty, glaikit, chowderheaded, silly, half-witted, brainless, thoughtless, incautious, injudicious, unwise, unreasonable, ill-considered, rash, foolhardy, absurd, pointless, inane, ridiculous, risible, dumb, dim-witted, damfool, hare-brained, pea-brained, thickheaded, mad, dippy, screwy, barmy, dotty, gormless, dumb-ass, and dotish.