adj. 25B6; adjective
they're rather stupid : UNINTELLIGENT, ignorant, dense, foolish, dull-witted, slow, simple-minded, vacuous, vapid, idiotic, imbecilic, imbecile, obtuse, doltish; informal thick (as two short planks), dim, dumb, dopey, dozy, moronic, cretinous, pea-brained, half-witted, soft in the head, boneheaded, thickheaded, wooden-headed, muttonheaded; Brit. informal barmy, daft, not the full shilling.
a stupid mistake : FOOLISH, silly, unintelligent, idiotic, scatterbrained, nonsensical, senseless, unthinking, ill-advised, ill-considered, unwise, injudicious; inane, absurd, ludicrous, ridiculous, laughable, risible, fatuous, asinine, mad, insane, lunatic; informal crazy, dopey, cracked, half-baked, cock-eyed, hare-brained, nutty, dotty, batty, gormless, cuckoo, loony, loopy, off one's head, off one's trolley; Brit. informal potty.
he drank himself stupid : INTO A STUPOR, into a daze, into oblivion; stupefied, dazed, unconscious.
intelligent, sensible.