improbable

adjective

im·​prob·​a·​ble (ˌ)im-ˈprä-bə-bəl 

-ˈpräb-bəl

: unlikely to be true or to occur

an improbable story

also : unlikely but real or true

their improbable come-from-behind victory

improbability

(ˌ)im-ˌprä-bə-ˈbi-lə-tē 

noun

improbably

(ˌ)im-ˈprä-bə-blē 

-ˈpräb-blē

adverb

Synonyms of improbable

• unlikely

Examples of improbable in a Sentence

The team made an improbable comeback.

it seems improbable that the two writers never met since they traveled in the same social circles

Recent Examples on the Web

So academics on the left and newspapers and so on, essentially saying that the American Revolution was all about slavery and that Britain was allowing the slaves to be freed, and all of this, so hooray for Britain, which was a very improbable development. —Sean Woods, Rolling Stone, 25 May 2026

Mallory Menacker asked, referencing the 1992 movie in which a bunch of misfit kids go from hockey novices to improbable winners. —Andrew Carter, Chicago Tribune, 24 May 2026

Indy has produced too many improbable comebacks and too many late-race twists for that. —Giovanni Malloy, Forbes.com, 23 May 2026

None of the others lived there as long as Macko, who happily talked about his improbable journey to the top. —Tyler Kepner, New York Times, 22 May 2026

Word History

Etymology

Middle French or Latin; Middle French, from Latin improbabilis, from in- + probabilis probable

First Known Use

1598, in the meaning defined above

Rhymes for improbable

• probable

Kids Definition

improbable

adjective

im·​prob·​a·​ble (ˈ)im-ˈpräb(-ə)-bəl 

: not probable : unlikely to be true or to occur

improbability

(ˌ)im-ˌpräb-ə-ˈbil-ət-ē 

noun

improbably

(ˈ)im-ˈpräb(-ə)-blē 

adverb