injustice vs unethicalness

injustice

noun
  • Unfairness; the state of not being fair or just. 

  • Violation of the rights of another person or people. 

  • Absence of justice; unjustice. 

unethicalness

noun
  • The quality of being unethical. 

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