(adjective) mad, frenzied, crazed, silly, rabid, crazy, insane, demented, foolish, idleheaded, moron, simple-minded or soft-headed (noun) fool, silly, mutt, berk, blockhead, dimwit, pumpkin head, moke, bonehead, noodle, simpleton, clodpoll, clodpole, clodpate, booby or mooncalf (adverb) not all there