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

If college is defined by unbelievable disasters that become lifelong stories, then this singular tale of friendship is forged in the aftermath of connecting through a very public mistake. — Alison Foreman, IndieWire, 17 Sep. 2026

Believable people with reasonable reactions forced to cope with seemingly unbelievable and unreasonable situations. — Culture Critic, Los Angeles Times, 11 Sep. 2026

Hill poured the putt in with ease and felt the embrace as the GB&I team completed a shocking, unbelievable comeback to win the Walker Cup. — Hugh Kellenberger, New York Times, 6 Sep. 2026

The Michigan Wolverines were beaten – and some would say literally – by Western Michigan on Saturday before one of the more unbelievable scenes in the sport's history unfolded. — Mark Harris Outkick, FOXNews.com, 6 Sep. 2026