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

The law of averages, the reality of the Republicans’ massive advantage in voter registration in Florida, and the plain fact of the Democrats’ losing streak in statewide elections all suggest that a 1982-style two-fer is impossible. — Steve Bousquet, Sun Sentinel, 22 Aug. 2026

There have been stretches of the season where scoring enough runs has felt impossible if Bryce Harper or Kyle Schwarber has an off day. — Charlotte Varnes, New York Times, 21 Aug. 2026

From gas stations to grocery stores, the reach is almost impossible to comprehend. — Jesse Kirshbaum, SPIN, 21 Aug. 2026

This scene would have been impossible to imagine just a decade ago. — Tibisay Zea, Christian Science Monitor, 21 Aug. 2026