Definition of wacko adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈwækəʊ//
; NAmE NAmE//ˈwækoʊ//
(informal) Describing strange traits
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crazy; not sensible wacko opinions See related entries: Describing strange traits Word Origin 1970s: from wacky + -o.
See the Oxford Advanced American Dictionary entry: wacko

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