faithless vs shifty

faithless

adj
  • Serving to disappoint or deceive 

  • Not true to allegiance, duty, or vows 

  • Lacking faith; lacking belief in something. 

  • Unfaithful (said of people, towards their partners) 

  • Not believing in God, religion, or a comparable ideology. 

  • Not observant of promises or covenants. 

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 faithless and shifty occurred in a corpus of books? (source: Google Ngram Viewer )