acquiescent vs unresponsive

acquiescent

adj
  • resting satisfied or submissive; disposed tacitly to submit 

  • willing to acquiesce, accept or agree to something without objection, protest or resistance 

unresponsive

adj
  • Indifferent or apathetic; emotionless. 

  • Not responsive; unreactive. 

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