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

That could change today after what has been an unbelievable two months for Eala on the court. — Lev Akabas, Sportico.com, 2 Aug. 2026

New York is a criminal’s playground, and the loss of our youngest people killed by constant violence is truly unbelievable and unacceptable! — Voice Of The People, New York Daily News, 1 Aug. 2026

The first walk-off home run of Clemens’ career set off a raucous celebration in the clubhouse, as the Twins went from having no pulse to running a marathon, delivering an unbelievable 4-3 victory over the Kansas City Royals at Target Field. — Dan Hayes, New York Times, 31 July 2026

What happened online, however, may have been even more unbelievable. — Lily Brown, PEOPLE, 29 July 2026