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 stage is set for unbelievable tension and suspense-building, and it's executed perfectly through Spielberg's directorial prowess with memorable scenes from raptors in the kitchen to a T-Rex in the toilet. — Grace Dean, Space.com, 1 July 2026

Kurtz would be ‘unbelievable’ in HRD His superstar teammate Nick Kurtz, who also has 19 long balls this season, has made a strong case for the Home Run Derby, too. — Sean Campbell, Sacbee.com, 30 June 2026

Druski also promised some unbelievable surprise performers during Culture’s Biggest Night. — Mikey Fresh, VIBE.com, 26 June 2026

Micron’s nearly unbelievable trajectory in just a year is due overwhelmingly to data-center demand, the company said. — The Editorial Board, Chicago Tribune, 26 June 2026