observant vs unblunted

observant

adj
  • Alert and paying close attention; watchful. 

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

unblunted

adj
  • Not blunted. 

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