inertness vs torpidity

inertness

noun
  • Absence of the power of self-motion; inertia. 

  • Quality of being unreactive with other chemical compounds or elements. 

  • Lack of activity or exertion; habitual indisposition to action or motion 

torpidity

noun
  • The property of being torpid. 

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