The crossing would have been laborsome for a horse; for an automobile it was unpassable.
It was a soul-stirring sight, and one of unpassable grandeur.
A day's march "through most unpassable rocks and cliffs" brought them to within sight of the island of San Juan at the east end.
But always there is a barrier between her and me; a barrier impalpable yet unpassable.
The unpassable danger of last night was only difficulty in the morning, and shakily and in fear he overcame it.
And so they came to the swart arboreal precipice of the unpassable forest.
It was a place among rocks, very steep, and unpassable for water.
There were sentries, but the night was dark, the marsh believed to be unpassable, the crossing carried out with stealthy skill.