casuistry vs deceptiveness

casuistry

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

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

deceptiveness

noun
  • the state or quality of being deceptive 

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