diabolic vs pious

diabolic

adj
  • Extremely evil or cruel. 

  • Showing wickedness typical of a devil. 

  • diabolic magic square 

pious

adj
  • Relating to religion or religious works. 

  • Of or pertaining to piety, exhibiting piety, devout, godfearing. 

  • Insisting on or making a show of one's own virtue, especially in comparison to others; sanctimonious, condescending, judgmental. 

How often have the words diabolic and pious occurred in a corpus of books? (source: Google Ngram Viewer )