infelicitous vs unappropriate

infelicitous

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

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

  • Unhappy or unfortunate. 

unappropriate

adj
  • Inappropriate; unsuitable. 

verb
  • To take from private possession; to restore to the possession or right of all. 

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