adj. 25B6; adjective STUPID, silly, idiotic, witless, brainless, mindless, unintelligent, thoughtless, half-baked, imprudent, incautious, injudicious, unwise; ill-advised, ill-considered, impolitic, rash, reckless, foolhardy; informal dumb, dim, dim-witted, half-witted, thick, gormless, hare-brained, crackbrained, pea-brained, wooden-headed; Brit. informal barmy, daft; Scottish & N. English informal glaikit; N. Amer. informal chowderheaded.
sensible, wise.