By the time an hour had passed the wall was high and unscalable.

Here, we ultimately end up with an unscalable mountain of high expectations.

The doors might open at the foot of unscalable cliffs.

The walls on each side of the canyon seemed sheer and unscalable.

The inside walls were perpendicular and unscalable in all but a single place.

Unscalable cliff face rose upon every side, except directly in my field of vision.

If it takes that many people to make the equipment to produce 0.7% of America’s energy needs, it’s totally unscalable.

The walls were vertical, and to almost all observers appeared unscalable.

Anyway, if you do reach that unscalable pinnacle, what about the rest of the world?

The bridge was four miles above, but unscalable walls made it impossible for him to reach that.

For truly we have arrived at my barrier now, and its faces are unscalable.

Its vertical sides seemed unscalable, save where the trail had been cut into the stone.

He was still trying to climb an unscalable height.

The steep canyon walls didn't mean anything to a bird, while the hundred feet or so were unscalable to her.

Directly above it, extending all the way to the summit, was an unscalable mass of gray rock.

Even in dry weather the walls would have been unscalable, and tonight they were streaming with wet.

The city nestled in a hollow between sheer, unscalable black walls.

It feels as though I had been steeling myself to batter down some unscalable wall.

They are a boundary, a dividing line, a wall impregnable and unscalable.

They were unscalable; at least, those before him were.

Above it the cliff rose, unscalable, to the summit.

On its opposite bank rose enormous forested slopes, which looked unscalable.

It is unscalable, but I have men watching it.

They have depicted his writings as unscalable mountains, and the general public has more often than not swallowed this line.