parlous vs tricky

parlous

adj
  • Attended with peril; dangerous, risky. 

  • Appalling, dire, terrible. 

tricky

adj
  • hard to deal with, complicated 

  • Relating to or associated with a prostitution trick 

  • adept at using deception 

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