barbarity vs callousness

barbarity

noun
  • The state of being barbarous; brutality 

  • A crude act 

  • crudity 

  • A barbaric act 

callousness

noun
  • The quality of being callous; emotional hardheartedness or indifference. 

  • The quality of having calluses. 

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