Synonyms of kook

1 Syllable

nut, crank

2 Syllables

flake, crackpot, weirdo, saphead, screwball, idiot, maniac, dingbat, crazy, wacko

3 Syllables

muttonhead, scatterbrain, scatterbrains, lunatic, fruitcake, nutcase, lamebrain

4 Syllables

sociopathic