Still he went on, for his mind was as utterly narrowed into that precipitous crevice of play as if he had been the most ignorant lounger there.
There are no more uses of "precipitous" in the book.
Show samples from other sources
He followed Hollis’s pink truck down a newly paved side street that sloped up precipitously, causing the Hearse’s worn-out engine to rev for its very life.
John Green -- An Abundance of Katherines
I realize, probably too late, that I wish to leave something of myself, a small service to Bedley Run, and not simply a respectable headstone, but after seeing the generic, forlorn closedness of the store, I feel precipitously insubstantial behind the wheel, like an apparition who has visited too long.