clandestinity vs slyness

clandestinity

noun
  • The quality or state of being clandestine. 

  • A diriment impediment in the canon law of the Roman Catholic Church, requiring the presence of witnesses to the marriage vows, one of whom must be a priest or a deacon. 

slyness

noun
  • The state or quality of being sly. 

  • The result or product of being sly. 

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