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

There is unbelievable disdain and resentment and anger toward this woman. —Roxana Hadadi, Vulture, 26 Mar. 2026

Tying a Hornets record for 3-pointers The only thing that was unbelievable about Tuesday night, in fact, was that the Hornets didn’t break a franchise record. —Alex Zietlow, Charlotte Observer, 25 Mar. 2026

An unbelievable fight these boys showed — being down the last two playoff games. —Charles Baggarly, Fort Worth Star-Telegram, 25 Mar. 2026

Shows, movies, and even YouTube videos feel cinematic with unbelievable contrast, vibrant colors, and smooth motion. —Juhi Wadia, PC Magazine, 24 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