Definitions
1.AdjectiveOf a thing, event, etc., no longer used or available; unknown to or forgotten by everyone.
2.AdjectiveOf a person, no longer existent, deceased.
3.AdjectiveOf a person, physically located in a remote place where one is unnoticed or incommunicado.
4.AdjectiveOf a person, mentally focused 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.