Synonyms of improbable

improbable

adjective

(ˌ)im-ˈprä-bə-bəl 

as in unlikely

not likely to be true or to occur

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

Synonyms & Similar Words

• unlikely
• doubtful
• questionable
• dubious
• odd
• impossible
• far-fetched
• flimsy
• bizarre
• implausible
• incredible
• inconceivable
• unapt
• unbelievable
• fantastical
• unthinkable
• unimaginable
• ridiculous
• absurd
• fantastic
• outlandish
• foolish
• nonsensical
• preposterous
• unreal
• insane
• crazy
• wild
• remote
• slight
• outside

Antonyms & Near Antonyms

• probable
• likely
• plausible
• possible
• conceivable
• potential
• credible
• earthly
• believable
• imaginable
• liable

Example Sentences

Recent Examples of improbable

The late-game onslaught started with an improbable catalyst. —Matt Byrne, Arkansas Online, 12 Apr. 2025

Francisco Lindor’s walk-off sacrifice fly capped an improbable 3-2 victory over the Toronto Blue Jays on a chilly, rainy night at Citi Field. —Peter Sblendorio, New York Daily News, 6 Apr. 2025

If that sounds improbable, note that QR codes are a magnet for fraudsters as well as marketeers. —David G.w. Birch, Forbes.com, 5 Apr. 2025

Trump signs executive order to expand 'clean' coal, but there's no such thing But the likelihood that the U.S. will return to a heavy reliance on coal is improbable, given the current energy infrastructure, emerging technologies and global trends, energy experts told ABC News. —Julia Jacobo, ABC News, 10 Apr. 2025