Synonyms of unbelievable

unbelievable

adjective

ˌən-bə-ˈlē-və-bəl 

as in incredible

too extraordinary or improbable to believe

a completely unbelievable story about why there was lipstick on his collar

Synonyms & Similar Words

• incredible
• incredulous
• impossible
• unlikely
• unimaginable
• inconceivable
• ridiculous
• unthinkable
• implausible
• absurd
• unreasonable
• fantastic
• questionable
• unconvincing
• doubtful
• unconceivable
• silly
• full of it
• dubious
• uncompelling
• debatable
• suspicious
• shaky
• hopeless
• fishy
• suspect
• disputable
• ludicrous
• flimsy
• laughable
• comical
• far-fetched
• outlandish
• farcical
• untenable
• preposterous
• indefensible
• dubitable
• dodgy
• doubtable
• risible
• insupportable

Antonyms & Near Antonyms

• plausible
• believable
• conceivable
• possible
• imaginable
• convincing
• credible
• creditable
• probable
• thinkable
• likely
• reasonable
• supposable
• cogitable
• undeniable
• unquestionable
• indisputable
• certain
• sure
• incontestable
• undoubted
• indubitable
• questionless

Example Sentences

Recent Examples of unbelievable

The 15 stories below range from frustrating to funny to downright unbelievable, but each comes with a practical takeaway that could help another traveler avoid the same fate. — Josh Rivera, USA Today, 19 July 2026

Simon Hughes Yet another unbelievable goal from Mbappe Whoever ends up winning the Golden Boot will have a highlight reel for the ages. — Amy Lawrence, New York Times, 9 July 2026

So to come out here and have a little competition, but then also with this unbelievable setting here in Tahoe. — Ashlyn Robinette, PEOPLE, 9 July 2026

The most unbelievable moment of the entire event came down to the elements. — Alejandro Avila Outkick, FOXNews.com, 3 July 2026