kook

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

Origin:
1955–60; perhaps alteration of cuckoo

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
kook (kuːk) [Click for IPA pronunciation guide]
 
n
informal (US), (Canadian) an eccentric, crazy, or foolish person
 
[C20: probably from cuckoo]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Kook is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a chattering or flighty, light-headed person.
Slang Dictionary

kook definition

[kuk]
  1. n.
    a strange person. : She seems like a kook, but she is just grand, really.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw Hill.
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Example sentences
It's one kook spouting gibberish, and a scientist debunking it.
Now stating that same opinion will get one branded as a kook or a shill for the tobacco industry.
There was kook in their countenance-an off-kilter vibe that was sympathetic and engrossing.
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