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Adjective: unsurmountable  ,ún-su(r)'mawn-tu-b(u)l
  1. Not capable of being surmounted or overcome
    "unsurmountable disadvantages";
    - insurmountable
     
  2. Incapable of being surmounted or climbed
    - unclimbable

See also: impassable, impossible, insuperable, unconquerable, unpassable