01 a. Incapable of being passed over, surmounted, or overcome; insuperable; as, insurmountable difficulty or obstacle.
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1.
Incapable of being passed over, surmounted, or overcome; insuperable; as, insurmountable difficulty or obstacle.“Hope thinks nothing difficult; despair tells us that difficulty is insurmountable.” — I. Watts.
Syn.
Insuperable; impassable; invincible.