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

The same fryer is also responsible for the unbelievable Croqu’Ailes Farcies XL, which are deboned chicken wings stuffed with more chicken and deep-fried. — Luke Pyenson, Condé Nast Traveler, 6 Nov. 2026

Angie for Florida and her grassroots movement did an unbelievable job. — Sun Sentinel Editorial Board, Sun Sentinel, 5 Nov. 2026

It’s managed by Will Gonzalez, who has done an unbelievable job in managing this as one holistic decision sciences and research team. — Nilay Patel, The Verge, 2 Nov. 2026

Gerry Burns, who runs Blue Island Music, says the amount of smoke coming from the building was unbelievable. — Marissa Perlman, CBS News, 2 Nov. 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