hebetate vs roil

hebetate

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

adj
  • obtuse; dull 

  • Having a dull or blunt and soft point 

roil

verb
  • To annoy; to make angry; to throw into discord. 

  • To romp. 

  • To render turbid by stirring up the dregs or sediment of. 

  • To bubble, seethe. 

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