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Longman Dictionary of Contemporary English
unconvincing
adjective
EXAMPLES FROM OTHER ENTRIES
▪ Peter came to me with a rather unconvincing apology.
▪ Their denial was unconvincing in view of the physical evidence linking them to the bombing.
EXAMPLES FROM CORPUS
▪ But for all of these gestures, Samper remains an unconvincing anti-drug crusader.
▪ She says she is enjoying her new life in Tokyo, but the tone of her voice is utterly unconvincing.
▪ Some of the description is superb, but the climbing remains unconvincing, slipping too easily into melodrama and strange terminology.
▪ The Friends, who accepted her as a member, found her unconvincing and turned her down as a minister.
▪ The House found that an unconvincing explanation.
▪ This leads to a slightly bizarre and unconvincing fusion of musical forces which all end up clumped awkwardly together.
▪ Unfortunately, the cast is part of the problem, with Mark Greenstreet downright unconvincing as Holmes.
Wiktionary
unconvincing

a. not convincing, plausible or believable

WordNet
unconvincing
  1. adj. not convincing; "unconvincing excuses"; "as unconvincing as a forced smile" [ant: convincing]

  2. having a probability to low to inspire belief [syn: improbable, unbelievable, unlikely]

Usage examples of "unconvincing".

Yet those marmoreal, immense arms and legs of hers, as they made leisurely, swimming movements through the air, looked palely unconvincing, as if arbitrarily tacked on to the bird attire.

Then, feeling resolute, she picked up her bags and headed for the unconvincing Santal the strange pink taxicab and the dark and stormy night.

The explanation was confused and spluttery, and the noise it made increased as it grew more and more unconvincing.

Marion character, who was this unconvincing mixture of Marion and Penny Pierce.

She was afraid I would be as unconvincing on the phone as I was by email, and that would just make her feel worse.

I have mentioned elsewhere in this book, spirit communications conveyed through mediums often turn out sounding simple, silly or unconvincing to anyone other than the person who is receiving the messages.

She heard the voices of the wardress and her colleague still chatthig outside, and she pursed her lips and tried a soft, unconvincing imitation of the whistle.

The wardress backed out of the cell with a muttered but unconvincing show of defiance and dragged the door closed behind her.

Cordula, but the caller turned out to be an old schoolmate, and Cordula feigned limpid delight, while making big eyes at Van over the receiver, and invented a number of unconvincing engagements.

The jaygee said nothing for a while and then uttered an unconvincing low laugh of disbelief.

Anderson said, with an unconvincing offhandedness, shifting in his chair.

He mumbled something that sounded unconvincing even to himself about overcompensation and, after a few seconds that felt more like minutes, had the vessel headed in the right direction.

Collis Raeburn had made a handsome, if somewhat unconvincing alien, while Butterfly had been sung by the prima donna of the Eureka Opera Company, Alanna Brooks.

Hugh Steeply did need the humiliations of his absurd field-personae, that the more grotesque or unconvincing he seemed likely to be as a disguised persona the more nourished and actualized his deep parts felt in the course of preparation for the humiliating attempt to portray.

At the other extreme were the debunkers, for whom all evidence, no matter the claimed quality or quantity of corroborating fact, was as entirely unconvincing.