hebetate vs vapid

hebetate

adj
  • Having a dull or blunt and soft point 

  • obtuse; dull 

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

vapid

adj
  • Lifeless, dull, or banal. 

  • Offering nothing that is stimulating or challenging. 

  • Tasteless, bland, or insipid. 

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