sheisty vs treacherous

sheisty

adj

  • unscrupulous 

  • shifty, untrustworthy 

treacherous

adj

  • Deceitful; inclined to betray. 

  • Unreliable; dangerous. 

  • Exhibiting treachery. 

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