Definition of unconvincing adjective from the Oxford Advanced American Dictionary

 

unconvincing

 adjective
adjective
NAmE//ˌʌnkənˈvɪnsɪŋ//
 
 
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not seeming true or real; not making you believe that something is true I find the characters in the book very unconvincing. His explanation was unconvincing. She managed a weak, unconvincing smile. opposite convincing
unconvincingly
 
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adverb He laughed unconvincingly.
See the Oxford Advanced Learner's Dictionary entry: unconvincing