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

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

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

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