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

 

nitwit

 noun
noun
BrE BrE//ˈnɪtwɪt//
 
; NAmE NAmE//ˈnɪtwɪt//
 
(informal) Stupid
 
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a stupid person See related entries: Stupid Word Origin early 20th cent.: apparently from nit ‘stupid person’ + wit.
See the Oxford Advanced American Dictionary entry: nitwit