lifeless vs mind-numbing

lifeless

adj
  • dull or lacking vitality 

  • inanimate; having no life 

  • dead; having lost life 

  • uninhabited, or incapable of supporting life 

mind-numbing

adj
  • Excessively boring, tedious, or dull; repetitive; of an activity, etc., lacking any interest or variety that might serve as intellectual stimulation. 

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