cruel vs unforgiving

cruel

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

  • Cool; awesome; neat. 

  • Harsh; severe. 

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) 

adv
  • To a great degree; terribly. 

unforgiving

adj
  • Unwilling or unable to forgive or show mercy. 

  • Having no allowance for weakness. 

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