Definition of kook in English:


Syllabification: kook
Pronunciation: /ko͞ok


North American informal
  • A crazy or eccentric person.
    More example sentences
    • Neither of them are kooks, they've simply been lied to by the people who are in charge.
    • I worry just as much, however, about the kooks out there who think that now is the time to plant a bomb.
    • The only people who cite the Columbia study are kooks and religious zealots.


1960s: probably from cuckoo.

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