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.
© Webster 1913.