double-dealing vs slyness

double-dealing

noun

  • deceit or treachery 

adj

  • Cheating, dishonest; treacherous. 

slyness

noun

  • The state or quality of being sly. 

  • The result or product of being sly. 

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