Synonyms of 'demoniac'

bedlamite, crackbrain, crackpot, crazed, crazy, dement, demonic, devilish, diabolic, energumen, fanatic, flake, fou, idiot, insane, inspired, kook, loon, loony, lunatic, madman, maniac, nut, phrenetic, satanic, screwball, serpentine, unhallowed, weirdo