oblivion[noun]Synonyms:- neglect, abeyance, disregard, forgetfulness
- unconsciousness, insensibility, obliviousness, unawareness 
Contrasted words: alertness, awareness, consciousness, memory, recall, recalling, recollection, remembrance
Related Words: nirvana, 
insensibleness [TahlilGaran] English Synonym Dictionary ▲
 o‧bliv‧i‧on /əˈblɪviən/ 
 noun [uncountable][
Date: 1300-1400; 
Language: Old French; 
Origin: Latin oblivio, from oblivisci 'to forget']
1.  when something is completely forgotten or no longer important
sink/slip/pass etc into oblivion Wind power presents too many advantages to be allowed to sink into oblivion.
 Wind power presents too many advantages to be allowed to sink into oblivion. The loser’s name has been consigned to oblivion (=completely forgotten).2.
 The loser’s name has been consigned to oblivion (=completely forgotten).2.  the state of being unconscious or of not noticing what is happening: 
 the oblivion of sleep
 the oblivion of sleep He had drunk himself into oblivion.
 He had drunk himself into oblivion.  [TahlilGaran] Dictionary of Contemporary English ▲