airheads, birdbrains, blockheads, boneheads, bubbleheads, chowderheads, chuckleheads, clodpolls(or clodpoles), clots(British), clucks, clunks, cretins, cuddies(British dialect), deadheads, dim bulbs(slang), dimwits, dips, dodoes(or dodos), dolts, donkeys, doofuses(also dufuses, slang), dopes, dorks(slang), dullards, dumbbells, dumbheads, dum-dums, dummies, dummkopfs, dunces, dunderheads, fatheads, ganders, golems, goofs, goons, half-wits, hammerheads, hardheads, idiots, ignoramuses(also ignorami), imbeciles, jackasses, know-nothings, knuckleheads, lamebrains, loggerheads(chiefly dialect), loons, lumps, lunkheads, meatheads, momes(archaic), morons, mugs(chiefly British), mutts, naturals, nimrods(slang), nincompoops, ninnies, ninnyhammers, nits(chiefly British), nitwits, noddies, noodles, numskulls(or numbskulls), oafs, pinheads, prats(British), ratbags(chiefly Australian), sapheads, schlubs(also shlubs, slang), schnooks(slang), simpletons, stocks, stupes, stupids, turkeys, woodenheads, yahoos, yo-yos

boobies, buffoons, fools, geese, loonies, lunatics, madmen, nuts, zanieslosersgawksfeatherbrains, scatterbrainsbeasts, boors, cads, churls, clowns, creeps, curs, heels, jerks, skunks(also skunk), snakes, stinkers, villains

dumb clucks