inarticulate vs unpronounceable

inarticulate

adj
  • not articulated in normal words. 

  • unable to speak with any clarity 

  • speechless 

  • not having joints or other articulations 

noun
  • An animal belonging to the subphylum Inarticulata. 

unpronounceable

adj
  • Impossible or difficult to pronounce or articulate. 

noun
  • Something difficult or impossible to pronounce. 

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