psyche
noun /ˈsaɪki/
  /ˈsaɪki/
(formal)- the mind; your deepest feelings and attitudes
- the human psyche
 - She knew, at some deep level of her psyche, that what she was doing was wrong.
 - Much is still not known about the long-term effects of mind-altering drugs on the human psyche.
 
Word Originmid 17th cent.: via Latin from Greek psukhē ‘breath, life, soul’.