Found 6 synonyms
Synonyms:
crazy, nut, loon, fruitcake, haywire, screwball, loco.Synonyms:
crackpot, nutcase, weirdo, nutter, maniac, madman.Synonyms:
whacko.Synonyms:
insane, mad, wacky, bonkers, nutty, certifiable, daft, cranky, screwy, barmy.Synonyms:
psychopath, sicko, basket case, mental.