inertia vs numbness

inertia

noun
  • In a person, unwillingness to take action. 

  • Lack of activity; sluggishness; said especially of the uterus, when, in labour, its contractions have nearly or wholly ceased. 

  • The property of a body that resists any change to its uniform motion; equivalent to its mass. 

numbness

noun
  • Inability or reduced ability to experience emotion. 

  • Absent or reduced sensitivity to cutaneous stimulation. 

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