affable vs mitigatory

affable

adj
  • Mild; benign. 

  • Receiving others kindly and conversing with them in a free and friendly manner; friendly, courteous, sociable. 

mitigatory

adj
  • reducing, lessening the effects of something, generally something painful or uncomfortable 

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