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

• fantastic
• fantastical
• implausible
• inconceivable
• incredible
• incredulous
• uncompelling
• unconceivable
• unconvincing
• unimaginable
• unthinkable

Examples of unbelievable in a Sentence

a completely unbelievable story about why there was lipstick on his collar

Recent Examples on the Web

And so to have someone like Carol Burnett on the show was an unbelievable bucket list dream. —Nick Caruso, TVLine, 24 Apr. 2025

Having the questions drafted by non-lawyers using artificial intelligence is just unbelievable. —ArsTechnica, 23 Apr. 2025

And there’s an unbelievable opening scene with Buzz Lightyear. —Clare Fisher, People.com, 22 Apr. 2025

Overnight in historic park hotels like the Lake Quinault Lodge deep within the misty, lush rainforest. Stay up late stargazing under unbelievable night skies. —Zoe Baillargeon, Travel + Leisure, 20 Apr. 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