half-witted

adjective informal

stupid, unintelligent, ignorant, dense, brainless, mindless, foolish, dull-witted, dull, slow-witted, witless, slow, dunce-like, simple-minded, empty-headed, vacuous, vapid, idiotic, moronic, imbecilic, imbecile, obtuse, doltish;

gullible, naive;

informal thick, dim, dumb, dopey, dozy, crazy, cretinous, birdbrained, pea-brained, pig-ignorant, bovine, slow on the uptake, soft in the head, brain-dead, boneheaded, lamebrained, thickheaded, chuckleheaded, dunderheaded, wooden, wooden-headed, fat-headed, muttonheaded;

British, informal daft, barmy, not the full shilling, thick as two short planks;

North American, vulgar slang dumb-ass.

▷antonyms intelligent, clever, astute.

half-witted Oxford Dictionary of English