aliene, ass, bedlamite, borderline case, crackbrain, crackpot, dement, demoniac, donkey, energumen, fanatic, flake, fou, idiot, imbecile, jackass, jerk, kook, loon, loony, lunatic, maniac, meshuggenah, nincompoop, ninny, non compos, noncompos, nut, phrenetic, psycho, psychopath, psychotic, raving lunatic, screwball, weirdo