ruthfulness vs sorriness

ruthfulness

noun
  • Mercifulness; pity. 

  • The state or condition of being ruthful; sorrowfulness; contrition. 

sorriness

noun
  • The state or quality of being sorry; regret. 

  • Worthlessness; wretchedness. 

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