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

And what an unbelievable cast and crew. —Dalton Ross, Entertainment Weekly, 16 Dec. 2025

James Cameron’s epic movies always ended up deserving such hype, and the motion capture technology used to make Avatar looked almost unbelievable. —Katie Grant, Parents, 16 Dec. 2025

The difference between these two performances makes the romance even more unbelievable, as the audience ponders what this seemingly confident woman sees in this immature putz. —Murtada Elfadl, Variety, 15 Dec. 2025

So yeah, Sinners was just an unbelievable breakout in 2025. —Dana Taylor, USA Today, 12 Dec. 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