precipitous

In 1965, despite the precipitous decline in the worker-to-retiree ratio, Social Security paid its bills with a 2.2% payroll tax.

It is on a plateau—the particular point that I mean—a plateau of precipitous mountains.

The road rose high above the lake, and in one or two places ran along the edge of a precipitous cliff.

For some distance round the hill the rocks were so precipitous, that we had no fear of being attacked on those sides.

The valley of the Dor is therefore shut in either by precipitous volcanic walls, or is guarded by sombre woods.

At the head of the canyon stood an extinct volcano, its precipitous sides forming the barrier at the western end of the canyon.