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 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

The trophies, numbers and unbelievable data that make up the first part of Williams’ career. — Ava Wallace, New York Times, 30 June 2026

From unbelievable nonfiction to childhood favorites, these classics are worth adding to your home library. — Karen Brewer Grossman, Southern Living, 25 June 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