An abyss [ə-bĭs’] is a deep hole, so deep as to seem bottomless. “The Abyss” refers to the infernal regions that include the abode of the dead, the home of evil powers, and the place of punishment of the wicked. The adjective is abysmal.
If you stare into the Abyss long enough the Abyss stares back at you.” – Friedrich Nietzsche
“We must be getting close,” Ms. Wicks said, tying into an anchor at the top of the 11th pitch. A dizzying abyss, wide and windy, expanded out, up, down and side to side from the climbers’ stance. (NY Times)