Boeotian, block, clod, dimwit, dolt, donkey, dope, dullhead, dumb cluck, dumbbell, dummkopf, dummy, dunce, gowk, idiot, ignoramus, jobbernowl, lackwit, lamebrain, lightweight, looby, loon, moron, niais, nincompoop, ninny, ninnyhammer, nitwit, noddy, put, simpleton, stupid, thickwit, witling