double-faced vs hollow-hearted

double-faced

adj
  • deceitful; hypocritical; treacherous 

  • Having two functional faces. 

hollow-hearted

adj
  • insincere; deceitful; treacherous; hypocritical. 

  • Yearning. 

  • Having a hole at the center. 

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