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
• 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 Gators scored before halftime to set the stage for an improbable comeback. — Edgar Thompson, The Orlando Sentinel, 28 Oct. 2026

The Tampa Bay Rays entered Tuesday night in the worst position in sports – down 3-0 in the World Series with a nearly impossible hill to climb to achieve the improbable. — Ryan Gaydos Outkick, FOXNews.com, 28 Oct. 2026

The improbable evening turned into a moving tribute to both Capra himself and his tale of the suicidal banker George Bailey, who comes to realize that his life has indeed been wonderful. — Los Angeles Times, 27 Oct. 2026

This one opens out to accommodate an improbable amount of worldly possessions— including a large laptop—without looking remotely utilitarian. — Elly Leavitt, Vogue, 22 Oct. 2026