improbable

adjective

im·​prob·​a·​ble (ˌ)im-ˈprä-bə-bəl How to pronounce improbable (audio)
-ˈpräb-bəl
Synonyms of improbablenext
: unlikely to be true or to occur
an improbable story
also : unlikely but real or true
their improbable come-from-behind victory
improbably
(ˌ)im-ˈprä-bə-blē How to pronounce improbable (audio)
-ˈpräb-blē
adverb

Synonyms of improbable

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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
When the Knicks erased a 29-point deficit against the Spurs in one of the most improbable playoff comebacks in franchise history, 9-year-old Bryce Booker burst into tears. Alaa Elassar, CNN Money, 13 June 2026 The error in the bottom of the 10th inning capped an improbable two-out rally with no one on base, overcoming a two-run deficit that had the Mets down to their final strike on more than one occasion. Will Sammon, New York Times, 13 June 2026 Each film will center on a different member of the Beatles’ point of view, intersecting to capture the band’s improbable journey from Liverpool to the center of global culture, culminating in their 1970 breakup. Brent Lang, Variety, 12 June 2026 SpaceX comes to the road show with its reusable Falcon 9 launch vehicle; the Starlink satellite network, which includes more than 10,000 satellites in orbit and counting; and a record of turning improbable space hardware into working systems. Chris Stokel-Walker, Scientific American, 12 June 2026 See All Example Sentences for improbable

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

Time Traveler
The first known use of improbable was in 1598

Browse Nearby Words

Cite this Entry

“Improbable.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/improbable. Accessed 16 Jun. 2026.

Kids Definition

improbable

adjective
im·​prob·​a·​ble (ˈ)im-ˈpräb(-ə)-bəl How to pronounce improbable (audio)
: not probable : unlikely to be true or to occur
improbably adverb

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