hebetate vs mitigate

hebetate

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

adj
  • obtuse; dull 

  • Having a dull or blunt and soft point 

mitigate

verb
  • To downplay. 

  • To reduce, lessen, or decrease; to make less severe or easier to bear. 

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