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

That second half is unbelievable to find a way to come out with a win. — Alex Kushel, Sun Sentinel, 18 Sep. 2026

Netflix documentary The Lost Children tells the almost unbelievable tale of four children stranded after a plane crash in the jungles of Colombia. — K. Thor Jensen, PC Magazine, 18 Sep. 2026

If college is defined by unbelievable disasters that become lifelong stories, then this singular tale of friendship is forged in the aftermath of connecting through a very public mistake. — Alison Foreman, IndieWire, 17 Sep. 2026

The details of the case were so puzzling as to be almost unbelievable, certainly unsolvable. — Steve Belanger, HollywoodReporter, 16 Sep. 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