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noun Slang.
  1. an eccentric, strange, or foolish person.
  2. an insane person.

Origin of kook

First recorded in 1955–60; perhaps alteration of cuckoo
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for kook


  1. US and Canadian informal an eccentric, crazy, or foolish person

Word Origin

C20: probably from cuckoo
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for kook


1960, American English slang; see kooky.

Online Etymology Dictionary, © 2010 Douglas Harper