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

Its basement level, though, has a modern history all its own, where an improbable number of right-moment, right-time restaurants have operated since early last decade — including its latest, exceptionally thrilling occupant. — Bill Addison, Los Angeles Times, 24 Sep. 2026

With the House in recess and the Senate soon to follow, a couple of improbable initiatives present the only path forward on an increasingly hazardous technology. — Ray Lewis, Baltimore Sun, 24 Sep. 2026

Earlier, that prospect had seemed improbable but independent analysts now put the odds around 50-50. — Susan Page, USA Today, 22 Sep. 2026

The third piece, particularly a Stanley Cup Final berth in 2028, feels wildly improbable. — Janson Duench, New York Times, 15 Sep. 2026