hebetate vs unprepossessing

hebetate

adj
  • Having a dull or blunt and soft point 

  • obtuse; dull 

verb
  • To render obtuse; to dull; to blunt. 

unprepossessing

adj
  • Unimpressive or unremarkable; dull and ordinary; nondescript. 

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