Synonyms and related words :
aliene, bedlamite, borderline case, crackbrain, crackpot, crazed, crazy, dement, demonic, devilish, diabolic, energumen, fanatic, fired, flake, fou, idiot, insane, inspired, kook, loon, loony, lunatic, madman, maniac, meshuggenah, noncompos, nut, phrenetic, raving lunatic, satanic, screwball, serpentine, unhallowed, weirdo