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Line breaks: kook
Pronunciation: /kuːk

Definition of kook in English:


North American informal
A mad or eccentric person.
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.

Definition of kook in:

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lively; cheerful