humanity vs mercilessness

humanity

noun
  • Any academic subject belonging to the humanities. 

  • The human condition or nature. 

  • The quality of being benevolent; humane traits of character; humane qualities or aspects. 

  • Humankind; human beings as a group. 

mercilessness

noun
  • The property of being merciless. 

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