Definition of "perilously"

A rather interesting and notable convenience, however, is that of ice water bags, which are hung on to the outside of the coaches at certain stops. These can be reached by leaning out of the window rather perilously, to unhook them, and paper cups are stocked in the compartments.

1951 February, K. Westcott Jones, “Some Australian Railway Byways”, in Railway Magazine, page 118

A door flopped open, wobbling perilously on its one remaining hinge.

1988, Douglas Adams, The Long Dark Tea-Time of the Soul, William Heinemann Ltd, page 90