Ahead of him was an impassable wall of tangled shrubbery.

He had a runway about ten feet long, bounded at either end by impassable walls.

Only for that nearly impassable wall, the entire earth would be overrun and dominated by these monsters in human guise.

Cliffs appeared in front of them, rising like impassable walls.

So I came to the second disappointment, a fall of rock, again fused into an impassable wall.

She could feel the walls around her, solid and impassable.

On a certain part of the first floor, there is a seemingly impassable wall of rubble.

The tangled brush and thick trees were knotted together into an impassable wall on either side.

It would create an impassable wall between the universes.

We cannot remove our respective sections from each other, nor build an impassable wall between them.