double-faced vs shifty

double-faced

adj
  • deceitful; hypocritical; treacherous 

  • Having two functional faces. 

shifty

adj
  • Having the appearance of being dishonest, criminal, or unreliable. 

  • Moving from one object to another; not looking directly and steadily at the person with whom one is speaking. 

  • Subject to frequent changes in direction. 

  • Resourceful; full of, or ready with, shifts or expedients. 

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