He argued unconvincingly.    From Wordnet, Princeton University. 

Spock’s perfect concentration was broken; he glanced over at McCoy, his expression unconvincingly calm, clearly expecting the worst.    From Wordnik.com.  [Demons] Reference

"I was naive to it all," she offers unconvincingly.    From Wordnik.com.  [Katie Price: 'People think I'm not normal'] Reference

"Three weeks," he corrected himself, unconvincingly.    From Wordnik.com.  [Danielle Crittenden: The Reno: How Will I Live Without You?] Reference

'Which I did steal,' he added, but most unconvincingly.    From Wordnik.com.  [Sharpe's Tiger]

Mr. Fine claps and says unconvincingly, “Good effort!”.    From Wordnik.com.  [Sadie Hawkins Day] Reference

The girls screamed unconvincingly and clutched each other.    From Wordnik.com.  [Death of a Fool]

Brian Ross did so for TVNewser, but rather unconvincingly.    From Wordnik.com.  [Games People Play: From Paris to Beijing to Iraq. A Week of Olympic Hopes and Political Scandals - MediaBizBuzz for August 11] Reference

Huh? Padma says, very unconvincingly, "I love your sashes.".    From Wordnik.com.  [Jane McGivney: Top Chef: Redemption of the DoubleBitch Twins] Reference

I nod my head unconvincingly and try to Google it in my head.    From Wordnik.com.  [Oh, Monsieur!] Reference

Attempts, unconvincingly, to bring it round to "do nothing" Tories.    From Wordnik.com.  [Gordon Brown, Charlie Whelan and Me] Reference

And now he's submitting to it entirely, if somewhat unconvincingly.    From Wordnik.com.  [John McCain follies] Reference

"Then you've got nothing to worry about," said Frost unconvincingly.    From Wordnik.com.  [Frost at Christmas]

“I trust her in every particular,” she added fiercely, unconvincingly.    From Wordnik.com.  [Son of a Witch]

DDT has only tenuously, and unconvincingly, been linked to cancer in humans.    From Wordnik.com.  [Jeff Dorchen: Astroturf and DDT = Libertarian Lobotomy] Reference

After you've been pleasantly or unconvincingly surprised, what do you think?.    From Wordnik.com.  [Susie Bright: Are You a Marryin' Fool?] Reference

Will doesn't work, except at his clothes and an unconvincingly cool-hearted pose.    From Wordnik.com.  [The Immediate Family] Reference

Many cases of police brutality have in the past been explained away unconvincingly.    From Wordnik.com.  [ANC Letters and Telegrams to the United Nations] Reference

He affects, unconvincingly, to have no real power and claims he's taking a back seat.    From Wordnik.com.  [Andrew Wylie: 'I'm a books person. Yes, I have a Kindle. I used it for an hour and a half and put it in the closet'] Reference

Richie snarled and swore unconvincingly, while Dave stared off at some world of his own.    From Wordnik.com.  [Red Dog]

He argued unconvincingly that they would let him alone, perhaps even make an outlaw of him.    From Wordnik.com.  [Lord of the Flies]

The same could be said - and just as unconvincingly - of your posts and Hillary supporters.    From Wordnik.com.  [Hillary Campaign: No, We Won The Nevada Caucuses] Reference

Ramaphosa publicists have hinted, again unconvincingly, at alleged ethnicity within the ANC.    From Wordnik.com.  [ANC Daily News Briefing] Reference

“To help Behren to find stability, and nothing more,” said Aydrian, rather unconvincingly.    From Wordnik.com.  [Immortalis]

News Feed ads are "well targeted — people like the content," Zuckerberg says, unconvincingly.    From Wordnik.com.  [Facebook Grows Up] Reference

Basilides himself claimed, rather unconvincingly, that his doctrine came from the apostle Peter.    From Wordnik.com.  [GNOSTICISM] Reference

“Of course I have tried,” answered Flaüss, unconvincingly, “but I am happy to try again.”.    From Wordnik.com.  [The Glass Books of the Dream Eaters]

It doesn't matter if they were errant anti-aircraft fire, as the Pentagon rather unconvincingly claims.    From Wordnik.com.  [CNN Transcript Apr 8, 2003] Reference

She leant forward, her rather prominent blue eyes misted with anxiety, her voice unconvincingly casual.    From Wordnik.com.  [Death of a Fool]

( "There is nothing mysterious about 'questioning,'" the manual's authors unconvincingly assure the reader.).    From Wordnik.com.  [Poet's Choice: "Will There Be More Than One 'Questioner'?" by Nick Lantz] Reference

I saw Andrea Mitchell on Hardball tonight and she was unconvincingly trying to explain away Rice's remark as innocent.    From Wordnik.com.  [Condi Rice's Tortured Macaca Moment] Reference

The bartender rises out of his stupor a little too quickly, a little too unconvincingly and makes the actress her drinks.    From Wordnik.com.  [Less Than Zero]

In recent comments, the two have unconvincingly declared that they work well together and dismissed any notion of a power struggle.    From Wordnik.com.  [Viacom's Deepening Management Crisis] Reference

Some convincingly, but more so unconvincingly, pose and prance before the whistle is blown and the hair pulling and clawing begins.    From Wordnik.com.  [angieyu Diary Entry] Reference

He wanted to shout out against the treatment, but he reminded himself, somewhat unconvincingly, that it was only a dream, after all.    From Wordnik.com.  [The Woods Out Back]