double-dealing vs principled

double-dealing

adj

  • Cheating, dishonest; treacherous. 

noun

  • deceit or treachery 

principled

adj

  • Based on, having, or manifesting principles 

  • strongly adhering to, or heedful of, guiding beliefs or moral rules 

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