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

Dubbed 'Flash Charging,' this allows the Atto 8’s massive 115-kilowatt-hour battery to rocket from a 10% charge up to 70% capacity in an almost unbelievable five minutes. — New Atlas, 17 Oct. 2026

What Zoe [Kazan] has done with Steinbeck’s East of Eden is just unbelievable. — Brian Davids, HollywoodReporter, 14 Oct. 2026

Marking 20 years as a band last month, and realizing we’ve been nominated 19 times for vocal group of the year, is unbelievable. — Melinda Newman, Billboard, 13 Oct. 2026

Here are more statement-making pieces at unbelievable prices. — Sarah Scott, Southern Living, 11 Oct. 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