hebetate vs lifeless

hebetate

adj
  • Having a dull or blunt and soft point 

  • obtuse; dull 

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

lifeless

adj
  • dull or lacking vitality 

  • inanimate; having no life 

  • dead; having lost life 

  • uninhabited, or incapable of supporting life 

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