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

In order to win now at the high-major level, there’s got to be unbelievable alignment from everybody, not just the coaching staff. —Colleen Kane, Chicago Tribune, 13 Mar. 2026

But Danny’s done an unbelievable job. —Joe Arruda, Hartford Courant, 13 Mar. 2026

Okay, let’s get into all else that went down on episode 3 of Survivor 50 in what is shaping up to be an unbelievable season so far. —Dalton Ross, Entertainment Weekly, 12 Mar. 2026

To have someone like that trust you in an incredible moment in their life is something that is just the most unbelievable honor. —Rachel Burchfield, InStyle, 12 Mar. 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