double-faced vs unfaithful

double-faced

adj
  • deceitful; hypocritical; treacherous 

  • Having two functional faces. 

unfaithful

adj
  • Negligent or imperfect. 

  • Not keeping good faith; disloyal; not faithful. 

  • Not honest or upright. 

  • Not faithfully rendering the meaning of the source language; incorrect. 

  • Not having religious faith. 

  • Adulterous. 

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