double-faced vs tricky

double-faced

adj
  • deceitful; hypocritical; treacherous 

  • Having two functional faces. 

tricky

adj
  • adept at using deception 

  • Relating to or associated with a prostitution trick 

  • hard to deal with, complicated 

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