penitence vs reluctance

penitence

noun
  • The condition of being penitent; a feeling of regret or remorse for doing wrong or sinning. 

reluctance

noun
  • Unwillingness to do something. 

  • Hesitancy in taking some action. 

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

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