oblivious
adjective /əˈblɪviəs/
  /əˈblɪviəs/
[not usually before noun]- not aware of something
- oblivious (of something) He drove off, oblivious of the damage he had caused.
 - oblivious (to something) You eventually become oblivious to the noise.
 - The couple seemed oblivious to what was going on around them.
 
Extra Examples- Lydia seemed oblivious, lost in her own thoughts.
 - He seemed oblivious to the fact that his wife was on the edge of a nervous breakdown.
 - His own arrogance made him oblivious to the criticisms of others.
 - This government is totally oblivious to the need for international cooperation.
 - She seemed almost oblivious to the crowds of reporters.
 - He was totally oblivious of her feelings.
 - They crept across the courtyard, oblivious of being watched.
 
Oxford Collocations Dictionaryverbs- appear
 - be
 - seem
 - …
 
- completely
 - quite
 - totally
 - …
 
- of
 - to
 
- oblivious to the fact that…
 
Word Originlate Middle English: from Latin obliviosus, from oblivio(n-), from oblivisci ‘forget’.