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1. Totally unlikely
   "Whatever is inconceivable is impossible";
   - inconceivable, out of the question, unimaginable
    
2. Not capable of occurring or being accomplished or dealt with
   "an impossible dream"; "an impossible situation"
    
3. (of a person or group of people) very annoying, unreasonable or difficult to deal with
   "impossible behaviour";
   - unacceptable

1. Something that cannot be done
   "his assignment verged on the impossible"

Derived forms: impossibles

See also: hopeless, impracticable, impractical, infeasible, insurmountable, intolerable, out, possibility, possibleness, unachievable, unattainable, unbearable, undecidable, undoable, unendurable, unfeasible, unrealisable [Brit], unrealistic, unrealizable, unsurmountable, unthinkable, unworkable

Type of: impossibility, impossible action

Antonym: possible

Encyclopedia: Impossible