gruff vs polite

gruff

adj
  • Of goods: bulky. 

  • hoarse-voiced. 

  • having a rough, surly, and harsh demeanor and nature. 

verb
  • To speak gruffly. 

polite

adj
  • Well-mannered, civilized. 

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