Synonyms of screwball

1 Syllable
nut, kook, goof
2 Syllables
blockhead, wacko, loonier, crackpot, saphead, beefhead, numbskull, lunkhead, crazier, cuckoo, amok, madmen, apest, dumbbell, aper, dement, loony, craziest, maniac, looney, hardhead, dingbat, bozo, clocker, crazy, madman
3 Syllables
knucklehead, bonehead, fanatic, fruitcake, madperson, nutcase, haywire, eccentric, lamebrains, crazyman, character, lamebrain