infelicitous vs mischanceful

infelicitous

adj
  • Unhappy or unfortunate. 

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

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

mischanceful

adj
  • unlucky 

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