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

Defending champion Scottie Scheffler somehow managed to stick around until the end, getting two bad bounces that cost him momentum, then getting one big break for a most improbable birdie but failing to birdie the 18th. — Doug Ferguson, Los Angeles Times, 19 July 2026

Defending champion Scottie Scheffler somehow managed to stick around until the end, getting two bad bounces that cost him momentum, then getting one big break for a most improbable birdie. — Doug Ferguson, Chicago Tribune, 19 July 2026

Pittsburgh jumped out to a 3-0 lead after four innings, which included an improbable RBI double by Esmerlyn Valdez in the third. — ABC News, 18 July 2026

Andy Burnham was elected leader of Britain’s Labour Party Friday, nearly the final step in an improbable takeover of British politics for the Greater Manchester mayor set to assume office as prime minister on Monday. — Joshua Yang, Washington Post, 17 July 2026