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Adjective: unpassable  ,ún'pã-su-b(u)l
  1. Incapable of being passed
    "For on the one side there is the sea, and on the other vast mountains and forests, unpassable to horsemen";
    - impassable
     
  2. (of a law or motion) impossible to be passed or approved
    "The controversial bill proved unpassable in parliament"

See also: unclimbable, unnavigable, unsurmountable, untraversable