Thesaurus

Synonyms for Stupid include:

addlebrained, addled, addlepated, anserine, backward, befogged, befuddled, blockheaded, boneheaded, brainless, cloddish, clouded, confused, cretinous, dazed, dazzled, delayed, dense, dim, dim-witted, doltish, dopey, dopy, dull, dumb, fatheaded, feebleminded, foolish, gaumless, gooselike, goosey, goosy, gormless, half-witted, headless, idiotic, imbecile, imbecilic, jerky, loggerheaded, lumpen, lumpish, moronic, muddled, muddleheaded, muzzy, nitwitted, obtuse, perplexed, potty, puddingheaded, punch-drunk, retarded, senseless, silly, simple, simple-minded, slaphappy, slow, slow-witted, soft-witted, spaced-out, stunned, stupefied, stupid, thick, thick-skulled, thickheaded, trancelike, unintelligent, unthinking, weak, witless, wooden-headed, woolly, woolly-headed, wooly, wooly-minded, yokel-like

stupid is a ADJ.

dolt, dullard, pilloc, pillock, poor fis, poor fish, pudden-head, pudding head, stupe, stupid, stupid person

stupid is a NOUN.