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See more synonyms for kook on Thesaurus.com
noun Slang.
  1. an eccentric, strange, or foolish person.
  2. an insane person.
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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

Related Words for kook

screwball, crackpot, lunatic, nut, crazy, flake, dingbat, crank, weirdo, fruitcake, wacko, lamebrain

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Contemporary Examples of kook

British Dictionary definitions for kook


  1. US and Canadian informal an eccentric, crazy, or foolish person
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Word Origin for kook

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.

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Online Etymology Dictionary, © 2010 Douglas Harper