propriety vs self-confidence

propriety

noun
  • The fact of possessing something; ownership. 

  • Suitability, fitness; the quality of being appropriate. 

  • Correctness in behaviour and morals; good manners, seemliness. 

self-confidence

noun
  • A measure of one's belief in one's own abilities 

  • The state of being self-confident 

How often have the words propriety and self-confidence occurred in a corpus of books? (source: Google Ngram Viewer )