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

But director Darin Stewart and producer Simone Ferretti stressed that these generative models democratize filmmaking, giving any creator access to shoot things that would be impossible outside a Christopher Nolan epic. — Sarah Shachat, IndieWire, 16 Oct. 2026

Instead, they are designed for environments where replacing a battery is impossible, prohibitively expensive, or life-threatening. — Christopher McFadden, Interesting Engineering, 16 Oct. 2026

Jenn Singer, founder of the namesake gallery in NYC, says that attributing a dollar value to the artwork by Haring is almost impossible. — Demetrius Simms, Robb Report, 16 Oct. 2026

But because documentaries are, for now, made by humans and not robots, pure objectivity is impossible. — Stephanie Zacharek, Time, 16 Oct. 2026