earnestness vs reluctance

earnestness

noun
  • The quality of being earnest; sincerity; seriousness. 

reluctance

noun
  • Hesitancy in taking some action. 

  • That property of a magnetic circuit analogous to resistance in an electric circuit. 

  • Unwillingness to do something. 

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