unsurmountable

Adjective
  1. Not capable of being surmounted or overcome (synset 302365671)
    "insurmountable disadvantages"
    also:
    • unconquerable - not capable of being conquered or vanquished or overcome
    • impossible - not capable of occurring or being accomplished or dealt with
    similar to: insuperable, unconquerable - incapable of being surmounted or excelled
    same as: insurmountable
  2. Incapable of being surmounted or climbed (synset 301729636)
    similar to: impassable, unpassable - incapable of being passed
    same as: unclimbable

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