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Adjective: impassable  im'pã-su-bul
  1. Incapable of being passed
    "For on the one side there is the sea, and on the other vast mountains and forests, impassable to horsemen"
    - unpassable

See also: unclimbable, unnavigable, unsurmountable, untraversable

Antonym: passable

Encyclopedia: Impassable

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