coercive vs involuntary

coercive

adj
  • Displaying a tendency or intent to coerce. 

  • Such that the ratio of |F(x)| to x approaches infinity as x approaches infinity. 

involuntary

adj
  • Without intention; unintentional. 

  • Not voluntary or willing; contrary or opposed to explicit will or desire; unwilling. 

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