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

Simon Hughes Yet another unbelievable goal from Mbappe Whoever ends up winning the Golden Boot will have a highlight reel for the ages. — Amy Lawrence, New York Times, 9 July 2026

So to come out here and have a little competition, but then also with this unbelievable setting here in Tahoe. — Ashlyn Robinette, PEOPLE, 9 July 2026

The most unbelievable moment of the entire event came down to the elements. — Alejandro Avila Outkick, FOXNews.com, 3 July 2026

The bread there is genuinely unbelievable…and the baba ganoush! — Shivani Vora, Forbes.com, 2 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