airhead, birdbrain, blockhead, bonehead, bubblehead, chowderhead, chucklehead, clodpoll(or clodpole), clot(British), cluck, clunk, cretin, cuddy(or cuddie, British dialect), deadhead, dim bulb(slang), dimwit, dip, dodo, dolt, donkey, doofus(slang), dope, dork(slang), dullard, dum-dum, dumbbell, dumbhead, dummkopf, dummy, dunce, dunderhead, fathead, gander, golem, goof, goon, half-wit, hammerhead, hardhead, idiot, ignoramus, imbecile, jackass, know-nothing, knucklehead, lamebrain, loggerhead(chiefly dialect), loon, lump, lunkhead, meathead, mome(archaic), moron, mug(chiefly British), mutt, natural, nimrod(slang), nincompoop, ninny, ninnyhammer, nit(chiefly British), nitwit, noddy, noodle, numskull(or numbskull), oaf, pinhead, prat(British), ratbag(chiefly Australian), saphead, schnook(slang), simpleton, stock, stupe, stupid, thickhead, turkey, woodenhead, yahoo, yo-yo

booby, buffoon, fool, goose, loony, lunatic, madman, nut, zanylosergawkfeatherbrain, scatterbrainbeast, boor, cad, churl, clown, creep, cur, heel, jerk, skunk, snake, stinker, villain

dumb cluck