The Collaborative International Dictionary of English v.0.48:
Unconvincing \Unconvincing\ See convincing.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]