DuckCorp Dico

Found one definition

1.                 From English-日本語 (にほんご) FreeDict+WikDict dictionary ver. 2022.11.18:
                   
   
   
                   
                     
   unconvincing /ʌŋkənvˈɪnsɪŋ/ <adj>
   腑に落ちない
   not convincing