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

Google’s teams have seen an increase in fake travel websites as the summer vacations get closer, usually luring victims with cheap prices and unbelievable experiences. —Davey Winder, Forbes.com, 30 May 2025

Reflecting on Rockingham’s recent ‘unbelievable turnout’ To understand the decision to put the racetrack up for sale, consider Rockingham Speedway’s past. —Alex Zietlow, Charlotte Observer, 28 May 2025

People are having unbelievable wars in their own families over these issues. —Cara Lynn Shultz, People.com, 27 May 2025

Deena Katz has cast our show from season one and has done an unbelievable job. —Lynette Rice, Deadline, 27 May 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