DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   unconvincing
       adj 1: not convincing; "unconvincing argument"; "as unconvincing
              as a forced smile" [syn: unconvincing, flimsy] [ant:
              convincing]
       2: having a probability too low to inspire belief [syn:
          improbable, unbelievable, unconvincing, unlikely]