infelicitous vs threnetic

infelicitous

adj
  • Unhappy or unfortunate. 

  • Inappropriate or awkward; not well said, expressed, or done. 

  • Of a sentence or utterance: not semantically and pragmatically coherent. 

threnetic

adj
  • Relating to a threne; sorrowful; mournful. 

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