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Impassable

Webster's Dictionary 1913

Im‐pass″a‐ble (?), a. [Cf. Unpassable.] Incapable of being passed; not admitting a passage; as, an impassable road, mountain, or gulf. Milton. — Im‐pass″a‐ble‐ness, n. — Im‐pass″a‐bly, adv.