Synonyms of impossible

impossible

adjective

(ˌ)im-ˈpä-sə-bəl 

as in unlikely

incapable of being solved or accomplished

the seemingly impossible problem of world hunger

fitting everything in my backpack seemed an impossible task

Synonyms & Similar Words

• unlikely
• hopeless
• problematic
• impractical
• futile
• unattainable
• incredible
• insoluble
• unrealizable
• useless
• absurd
• undoable
• impracticable
• insuperable
• unsolvable
• insolvable
• infeasible
• questionable
• improbable
• unfeasible
• unworkable
• dubious
• inconceivable
• unusable
• unthinkable
• ridiculous
• unbelievable
• implausible
• unimaginable
• suspicious
• doubtful
• debatable
• suspect
• shaky
• disputable
• fishy
• far-fetched
• fantastic
• outlandish
• shady
• preposterous
• doubtable

Antonyms & Near Antonyms

• possible
• feasible
• achievable
• workable
• reasonable
• useful
• attainable
• practical
• soluble
• applicable
• practicable
• doable
• likely
• functional
• probable
• usable
• working
• serviceable
• realizable
• acceptable
• resolvable
• plausible
• conceivable
• credible
• believable

Example Sentences

Recent Examples of impossible

According to the American Cancer Society, catching cancer from another person is essentially impossible. — Dr. Yonathan Daniel, ABC News, 25 July 2026

Orange County has had more than 100 football players transferring to different schools this offseason, and policing the legality of the transfers seems almost impossible. — Chris Hays, The Orlando Sentinel, 25 July 2026

The film itself is about a Jewish woman who refuses the limits imposed on her mind and disguises herself as a man in order to study, and the parallel was impossible to miss. — Debbie Millman, Time, 25 July 2026

An openly gay man in Catholic Italy as well as an old-school romantic, Visconti was cinema’s great poet of impossible loves. — Bilge Ebiri, Vulture, 24 July 2026