inertness vs stagnation

inertness

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

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

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

stagnation

noun
  • Inactivity. 

  • The state of being stagnant, without circulation. 

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