Wiktionary
unconvincingly
adv. In an unconvincing manner.
WordNet
unconvincingly
adv. in an unconvincing manner; "he argued unconvincingly" [ant: convincingly]
Usage examples of "unconvincingly".
The other, Baer, slight and nervous, noisily and unconvincingly extroverted, laughed, nudged, and clapped shoulders, and maintained a continuous commentary on whatever was being said: "Fine, fine, right, sure, sure, wonderful, yes, yes, exactly, fine, good.