Definition of kook noun from the Oxford Advanced Learner's Dictionary

 

kook

 noun
noun
BrE BrE//kuːk//
 
; NAmE NAmE//kuːk//
 
(informal, especially North American English) Describing strange traits
 
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a person who acts in a strange or crazy way He was dismissed as a kook for saying what he thought. See related entries: Describing strange traits Word Origin 1960s: probably from cuckoo.
See the Oxford Advanced American Dictionary entry: kook