anguish vs remorselessness

anguish

verb

  • To cause to suffer pain. 

  • To suffer pain. 

noun

  • Extreme pain, either of body or mind; excruciating distress. 

remorselessness

noun

  • the characteristic of lacking remorse 

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