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

Yet the procedural is so formulaic and the twists so unbelievable that even the most lackadaisical viewer will likely solve the mysteries long before the truth is revealed. — Aramide Tinubu, Variety, 7 Aug. 2026

Deception has always existed in business, but AI has magnified it to unbelievable levels. — Muhamad Aly Rifai, Forbes.com, 6 Aug. 2026

His wit, his humanity, his unbelievable recall of plays, events, games and moments remain, leukemia or no leukemia. — Marcos Breton, Sacbee.com, 5 Aug. 2026

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