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

But more than that this devestating loss has also given so many an unbelievable gift. —Kimberly Nordyke, HollywoodReporter, 23 Dec. 2025

Philips said the story behind Dior Addict Lip Glow Oil is unbelievable. —Jennifer Weil, Footwear News, 22 Dec. 2025

Halfway through the second verse, Was thought, Oh, man, this is unbelievable. —Alex Abramovich, New Yorker, 22 Dec. 2025

Testimony had paused for the weekend when Moore’s lawyer called him early one Saturday this July with what felt to him like unbelievable news. —Jessica Schreifels, CNN Money, 18 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