modesty vs propriety

modesty

noun
  • The quality of being modest; having a limited and not overly high opinion of oneself and one's abilities. 

  • Moderate behaviour; reserve. 

  • Pudency, avoidance of sexual explicitness. 

propriety

noun
  • Suitability, fitness; the quality of being appropriate. 

  • The fact of possessing something; ownership. 

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

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