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

So to be in this position is extraordinary for me, and really quite unbelievable. —Georg Szalai, HollywoodReporter, 25 Nov. 2025

There are unbelievable amounts of hard work, trauma and bleeding all over script pages every day. —Destiny Jackson, Deadline, 21 Nov. 2025

One even clocks in at an unbelievable 90 percent off. —Chaise Sanders, Travel + Leisure, 21 Nov. 2025

Well, Fräulein’s fruit actually came from California; these distillations of Maui are doubly unbelievable in the dead of winter. —The Atlantic, 19 Nov. 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