mournful vs threnetic

mournful

adj
  • Filled with grief or sadness; being in a state in which one mourns. 

  • Fit to inspire mourning; tragic. 

threnetic

adj
  • Relating to a threne; sorrowful; mournful. 

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