Synonyms of stupid

1 Syllable

crass, dim, rash, slow, dazed, dull, dolt, thick, dumb

2 Syllables

dumdums, numbskull, schizoid, goofy, inapt, tactless, dense, idiot, doltish, lumpish, banal, crasser, loopy, ho-hum, tomfool, pointless, dummy, sillier, corny, witless, torpid, dopey, hohum, schlemiel, sappy, lagging, boring, naive, silly, duller, cornfed, simple, sluggish, gorked, whacko, dullest, absurd, madcap, corniest, cornier, dippy, potty, silliest, prosy, crassest, mopish, sappier, prosier, loser, foolish, pottier, vacuous, trivial, triper, goofier, dumdum, listless, brainless, mindless, stolid, scrapper

3 Syllables

off-the-wall, insipid, meaningless, farcical, half-baked, lunatic, senseless, cretinous, short-sighted, unhandy, near-sighted, unthinking, obtuse, inconscious, clodpate, muttonhead, untactful, inane, futile, half-witted, thick-headed, stupefied, thickheaded, noplace, softheaded, indiscreet, puerile, retardo, useless, idiotic, masklike, gullible, birdbrained, inadept, deficient, pigheaded, shortsighted, ludicrous, retarded, moronic, laughable

4 Syllables

irrational, ill-advised, unusable, preposterous, impolitic, unsagacious, pokerfaced, cockamamy, muddleheaded, unreasoning, cockamamie, simple-minded, feebleminded, simpleminded, unfunctional, unusuable, insensate, nongermane, nonsensical, nonfunctional, asinine, expressionless, inutile, comatose, irrelevant, lamebrained, ill-adapted, imbecilic, empty-headed, unproficient, unenjoyable, characterless, scatterbrained

5 Syllables

unreasonable, undiplomatic, unprogressive, anencephalic, anencephalous, unintelligent, uninteresting, underachieving, unentertaining, unreflective

6 Syllables

unconsiderate