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 return of the wolf in California has been met with joy by conservationists, who delight in the improbable population rebound, and with fury by ranchers who bemoan the toll on their cattle. — Clara Harter, Los Angeles Times, 9 July 2026

Lithium-ion batteries degrade significantly over time, making powering up improbable. — Ewan Spence, Forbes.com, 6 July 2026

The nearly two-minute teaser opens by revisiting the skepticism that greeted Oasis’ improbable reunion announcement in 2024. — Spin Staff, SPIN, 4 July 2026

The Argentina great scored another goal — his eighth of the tournament — and led his team to an improbable 3-2 victory over Egypt on Tuesday despite trailing by two with only 11 minutes of regulation time to play. — James Robson, Twin Cities, 7 July 2026