lifeless vs vacant

lifeless

adj
  • inanimate; having no life 

  • dull or lacking vitality 

  • dead; having lost life 

  • uninhabited, or incapable of supporting life 

vacant

adj
  • Showing no intelligence or interest. 

  • Not occupied; empty. 

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