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

Matthew Stafford has an unbelievable ability to get the ball out of his hand fast which is hard to get home on. — Nick Harris, Fort Worth Star-Telegram, 12 Aug. 2026

Yet the procedural is so formulaic and the twists so unbelievable that even the most lackadaisical viewer will likely solve the mysteries long before the truth is revealed. — Aramide Tinubu, Variety, 7 Aug. 2026

Deception has always existed in business, but AI has magnified it to unbelievable levels. — Muhamad Aly Rifai, Forbes.com, 6 Aug. 2026

His wit, his humanity, his unbelievable recall of plays, events, games and moments remain, leukemia or no leukemia. — Marcos Breton, Sacbee.com, 5 Aug. 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