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

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

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