casuistry vs fallaciousness

casuistry

noun
  • A specious argument designed to defend an action or feeling. 

  • The process of answering practical questions via interpretation of rules, or of cases that illustrate such rules, especially in ethics; case-based reasoning. 

fallaciousness

noun
  • The property of being fallacious. 

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