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

• 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

Two suspects with connections to the unbelievable Louvre heist that took the world by storm last week have been arrested by authorities, CNN reported. —Nicole Hoey, Robb Report, 27 Oct. 2025

Part of what made Alfred Hitchcock's The Birds so fascinating was how unbelievable the story was. —Stephanie Sengwe, PEOPLE, 25 Oct. 2025

The amounts of prejudice that are built up in those Kingdom Halls, unbelievable. —Nick Romano, Entertainment Weekly, 24 Oct. 2025

The Freewheel is a light (less than 16 ounces) and breathable soft-shell outer layer made from a mix of spandex and recycled nylon to give the jacket unbelievable stretch. —Graham Averill, Outside, 24 Oct. 2025

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