discourtesy vs gallantry

discourtesy

noun
  • Lack of courtesy; rudeness. 

  • A rude act. 

gallantry

noun
  • an instance of gallant behaviour or speech 

  • chivalrous courtliness, especially towards women 

  • courage 

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