Mentally focussed on one's own thoughts or feelings, or on some task, to such a degree that one is unaware of other people or of one's surroundings; unconscious.
No longer used or available; unknown to or forgotten by everyone.
No longer existent, deceased.
Physically located in a remote place where one is unnoticed or incommunicado.
Standing erect but not consciously aware of one's surroundings, or only minimally aware, and having little or no ability to control one's bodily actions, as a result of physical injury or exhaustion.
Stupefied; dazed; nonfunctional.