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



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 Origin1960s: probably from cuckoo.
See the Oxford Advanced American Dictionary entry: kook