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

Watch the full video for more unbelievable moments from 30,000 feet. —Meena Thiruvengadam, Travel + Leisure, 1 May 2026

Summer might be ideal for a windows-down drive, but fall here—with vibrant yellow and orange foliage—is unbelievable. —Midwest Living, 30 Apr. 2026

And by the way, an unbelievable queen. —Swapna Venugopal Ramaswamy, USA Today, 29 Apr. 2026

Senato said his focus is on preparing for Argyle and spoke highly of the program, noting that Argyle has an unbelievable tradition and expects to win. —Charles Baggarly, Fort Worth Star-Telegram, 28 Apr. 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