insurmountable

Impossible to surmount; insuperable.

Not surmountable; incapable of being surmounted, passed over, or overcome.

Incapable of being passed over, surmounted, or overcome; insuperable.

Incapable of being passed over, surmounted, or overcome; insuperable; as, insurmountable difficulty or obstacle.

impossible to surmount

not capable of being surmounted or overcome