nastiness vs ruthlessness

nastiness

noun
  • Indecency; corruption; unkindness, meanness, spite, harshness, cruelty. 

  • Lack of cleanliness. 

  • Dirt, filth. 

  • A nasty action, object, quality, etc. (all senses of nasty). 

  • Unpleasantness, disagreeableness (to the senses). 

ruthlessness

noun
  • The property of being ruthless. 

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