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

What to know: An improbable NCAA Tournament appearance after the program was gutted from the Pac-12 dissolution.. —Michael Waterloo, The Athletic, 16 Mar. 2025

Glamour is about carriage and perception, and in this way is humor’s improbable sibling. —Nathan Heller, The New Yorker, 15 Mar. 2025

And to make things worse – a geologically improbable volcano threatens to end all life in Fresno, California. —Katie Campione, Deadline, 14 Mar. 2025

Saudi Arabia, a country that is largely made up of desert, has fewer than 40 million people, and boasts a middling military with no nuclear arms, may be emerging as the 21st century’s most improbable superpower. —Ned Temko, The Christian Science Monitor, 13 Mar. 2025