unplausible Synonyms

Strongest:

not persuasive or believable

The politician's excuse for missing the meeting was so unplausible that even his own supporters couldn't believe it.
The student's explanation for why he didn't study for the exam was unplausible and the teacher refused to accept it.
The witness's testimony was unplausible because it contradicted all the other evidence presented in court.
The suspect's alibi was so unplausible that the police arrested him immediately.
The news story about the alien invasion was so unplausible that no one believed it.
The company's financial projections were so unplausible that investors refused to invest in the business.
The scientist's theory about the origins of the universe was so unplausible that it was ridiculed by his peers.
The singer's excuse for lip-syncing at her concert was so unplausible that her fans booed her off stage.
The actor's performance in the movie was so unplausible that it ruined the entire film.
The athlete's claim that he had never taken performance-enhancing drugs was so unplausible that he was banned from competition.

not persuasive or believable

fantastical, implausible, unbelievable, absurd, ridiculous, impossible, unlikely, far-fetched,improbable, incredible

credible, effective, probable, likely,plausible, believable, creditable, presumptive, conceivable, decisive

The politician's excuse for missing the meeting was so unplausible that even his own supporters couldn't believe it.

The student's explanation for why he didn't study for the exam was unplausible and the teacher refused to accept it.

The witness's testimony was unplausible because it contradicted all the other evidence presented in court.

The suspect's alibi was so unplausible that the police arrested him immediately.