unconvincing

Anything that's unconvincing is unlikely or hard to believe. Your unconvincing story about being abducted by aliens probably won't persuade your teacher to give you an extension on your term paper.

Your unconvincing impersonation of President Ronald Reagan might sound more like John Wayne, and an unconvincing alibi won't get a suspect off the hook if a detective thinks she's guilty. The adjective unconvincing comes from convince, "cause to believe in the truth of something," and its root that means "to conquer." If you haven't convinced someone of some fact or truth, you've been unconvincing.

Definitions of unconvincing
1

adj not convincing

unconvincing argument”
“as unconvincing as a forced smile”
Synonyms:
flimsy
unpersuasive
not capable of persuading
incredible, unbelievable
beyond belief or understanding
Antonyms:
convincing
causing one to believe the truth of something
credible
appearing to merit belief or acceptance
disenchanting, disillusioning
freeing from illusion or false belief
persuasive
intended or having the power to induce action or belief
show more antonyms...

adj having a probability too low to inspire belief

Synonyms:
improbable, unbelievable, unlikely
implausible
having a quality that provokes disbelief

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