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

The access that the Biden administration gave you was unbelievable. —Addie Morfoot, Variety, 8 Mar. 2025

Stephanie has just published a book about her unbelievable friendship with Emily, and is preparing to send her son Miles (Joshua Satine), a precocious adolescent condemned to being an instrument for exposition, to camp. —Lovia Gyarkye, The Hollywood Reporter, 7 Mar. 2025

Walsh and Nixon met in an unbelievable way: on a ship just before the pandemic. —Stephanie Sengwe, People.com, 6 Mar. 2025

Hopefully Novocaine spawns a series, that'd be unbelievable. —H. Alan Scott, Newsweek, 5 Mar. 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