improbable

Definitions

Not likely to be true or to happen.

Unlikely to be the case or to occur.

Examples

It is highly improbable that the team will win the championship after losing their star player.

The detective found it improbable that the suspect could have been in two places at the same time.

Synonyms

unlikely doubtful implausible far-fetched questionable dubious unconvincing

Antonyms

likely probable plausible believable certain expected conceivable