Adjective
(of a thing, event, etc) No longer used or available; unknown to or forgotten by everyone.
(of a person) No longer existent, deceased.
(of a person) Physically located in a remote place where one is unnoticed or incommunicado.
(of a person) 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.
Source: en.wiktionary.orgA great deal of talent is lost to the world for want of a little courage. Every day sends to their graves obscure men whose timidity prevented them from making a first effort. Sydney Smith
A man's desire for a son is usually nothing but the wish to duplicate himself in order that such a remarkable pattern may not be lost to the world. Helen Rowland
A great deal of talent is lost to the world for the want of a little courage. Every day sends to their graves a number of obscure men who have only remained obscure because their timidity has prevented them from making a first effort. Sydney Smith
Without the church there would be no Scotland - and something important, precious and distinctive would have been lost to the world. Alex Salmond