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 real reason is that his report is an unfocused jumble of personal testimony, with no evident attempt to corroborate the lurid and sometimes unbelievable accusations made by anonymous sources. — Helen Lewis, The Atlantic, 26 July 2026

There are two unbelievable bargains hidden in the fine print of the Connecticut Pizza & Brew Fest to take place August 2 at Hartford HealthCare Amphitheater in Bridgeport. — Pamela McLoughlin, Hartford Courant, 25 July 2026

Floor-to-ceiling windows let in unbelievable views of East Antarctica’s peaks and ice fields; blackout blinds shield you at night from the midnight sun. — Laura Dannen Redman, Robb Report, 23 July 2026

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