kook

Noun

1.

kook - someone regarded as eccentric or crazy and standing out from a group Synonyms: odd fellow, odd fish, odd man out, queer bird, queer duck

alien, aliene, bedlamite, borderline case, case, character, crackbrain, crackpot, crank, cuckoo, dement, demoniac, ding-a-ling, eccentric, energumen, erratic, fanatic, flake, fou, freak, harebrain, hermit, hobo, idiot, lone wolf, loner, loon, loony, lunatic, madman, maniac, maverick, meshuggenah, natural, noncompos, nonconformist, nut, odd fellow, oddball, oddity, original, outsider, pariah, phrenetic, queer duck, queer fish, queer specimen, rara avis, raving lunatic, recluse, screwball, solitary, strange duck, tramp, type, weirdo, zealot