intrepid vs lifeless

intrepid

adj
  • Fearless; bold; brave. 

lifeless

adj
  • inanimate; having no life 

  • dull or lacking vitality 

  • dead; having lost life 

  • uninhabited, or incapable of supporting life 

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