unbelievable

adjective

un·​be·​liev·​able ˌən-bə-ˈlē-və-bəl 

: too improbable for belief

The plot is unreal and unbelievable.

also : of such a superlative degree as to be hard to believe

the destruction was unbelievable

made an unbelievable catch in center field

unbelievably

ˌən-bə-ˈlē-və-blē 

adverb

Synonyms of unbelievable

• incredible
• incredulous
• impossible
• unlikely

Examples of unbelievable in a Sentence

a completely unbelievable story about why there was lipstick on his collar

Recent Examples on the Web

Each goal seemed to be more unbelievable than the last, whether because of Valverde’s speed, the ease of finishing or the way the Bernabeu erupted — just the once this season — into a familiar state of euphoria on a European night. —Guillermo Rai, New York Times, 27 May 2026

The film fictionalized the Rockford Peaches’ story—but the league itself had already done the unbelievable. —Encyclopedia Britannica, 26 May 2026

My dream is to have an unbelievable family. —Louisa Thomas, New Yorker, 24 May 2026

Who buys properties at tax auction To the uninitiated, a county tax auction might seem like a place to get an unbelievable deal on a property. —Graham Womack may 18, Sacbee.com, 18 May 2026

Word History

First Known Use

1548, in the meaning defined above

Rhymes for unbelievable

• achievable
• believable
• conceivable
• perceivable
• receivable
• retrievable
• inconceivable
• irretrievable

Kids Definition

unbelievable

adjective

un·​be·​liev·​able ˌən-bə-ˈlē-və-bəl 

1

: too unlikely for belief

an unbelievable story

2

: very significant or impressive

made an unbelievable catch in center field

unbelievably

-blē 

adverb