atrabilious vs threnetic

atrabilious

adj
  • Characterized by melancholy. 

  • Ill-natured; malevolent; cantankerous. 

threnetic

adj
  • Relating to a threne; sorrowful; mournful. 

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