cruel vs stone-hearted

cruel

adv
  • To a great degree; terribly. 

verb
  • To violently provoke (a child) in the belief that this will make them more assertive. 

  • To spoil or ruin (one's chance of success) 

adj
  • Cool; awesome; neat. 

  • Intentionally causing or reveling in pain and suffering; merciless, heartless. 

  • Harsh; severe. 

stone-hearted

How often have the words cruel and stone-hearted occurred in a corpus of books? (source: Google Ngram Viewer )