In′sur‐mount″a‐ble (?), a. [Pref. in- not + surmountable: cf. F. insurmountable.] Incapable of being passed over, surmounted, or overcome; insuperable; as, insurmountable difficulty or obstacle. Locke.
Hope thinks nothing difficult; despair tells us that difficulty is insurmountable. I. Watts.
Syn. — Insuperable; impassable; invincible.