unappropriate vs unspeakable

unappropriate

adj
  • Inappropriate; unsuitable. 

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

unspeakable

adj
  • Unfit or not permitted to be spoken or described. 

  • Incapable of being spoken or uttered 

  • Impossible to speak about. 

  • Extremely bad or objectionable. 

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