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

Plush toys and squeezy bath toys may be impossible to sanitize, so skip bringing those home. — Brandee Gruener, Southern Living, 1 Aug. 2026

Putting in a massive new underground cable network to connect the capital with other towns and cities was nearly impossible with the technology of the time. — David Szondy august 01, New Atlas, 1 Aug. 2026

Social media and streaming have fractured the traditional advertising model in ways that are impossible to ignore. — Ashlee Difuntorum, Forbes.com, 1 Aug. 2026

The final out proves impossible for the Kansas City Royals once again. — Pete Grathoff, Kansas City Star, 31 July 2026