observant vs unaware

observant

adj
  • Diligently attentive in observing a law, custom, duty or principle; regardful; mindful. 

  • Alert and paying close attention; watchful. 

unaware

adj
  • Not noticing; paying no heed; thoughtless; inattentive. 

  • Not aware or informed; lacking knowledge. 

How often have the words observant and unaware occurred in a corpus of books? (source: Google Ngram Viewer )