castoff vs reluctance

castoff

noun
  • Something that has been rejected or discarded; a reject. 

adj
  • discarded, rejected. 

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 castoff and reluctance occurred in a corpus of books? (source: Google Ngram Viewer )