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

 

ninny

 noun
noun
BrE BrE//ˈnɪni//
 
; NAmE NAmE//ˈnɪni//
 
(pl. ninnies)(old-fashioned, informal)
 
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a stupid person Don’t be such a ninny. Word Origin late 16th cent.: perhaps from innocent.
See the Oxford Advanced American Dictionary entry: ninny