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

What an unbelievable joy to have shared a sound stage with him and to engage with such a master talent. — Selome Hailu, Variety, 26 Aug. 2026

Some of these 11- and 12-year-olds had unbelievable personalities, like a player named Matt Cassel. — Eric Sondheimer, Los Angeles Times, 23 Aug. 2026

My feed was a deluge of content from the afternoon, the unbelievable bay sight lines contraposed with the towering bent-car Chamberlain sculptures that have remained in situ since their creator’s passing. — Nate Freeman, Vanity Fair, 21 Aug. 2026

These are eight facts about women in medical research that are downright insane, infuriating and, in some cases, just unbelievable. — Emily Cegielski, Flow Space, 19 Aug. 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