impassable

German found the old road blocked up with fallen rocks, so as to be impassable.

In the south, however, this ancient custom still remains in full force; the doors there are yet impassable to lovers.

The idea of caste as an eternal and impassable barrier has largely determined the history of India.

In fact, an impassable gulf yawned between the old Roman religion and modern Roman thought.

Souls reach out to each other across the impassable gulfs of individual being.