appall vs hebetate

appall

verb
  • To fill with horror and/or indignation; to dismay. 

hebetate

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

adj
  • obtuse; dull 

  • Having a dull or blunt and soft point 

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