inertness vs supineness

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. 

supineness

noun
  • Total submissiveness; flat on one's back, lacking any backbone; with total abandon; prostrate; supine 

  • The state of being supine. 

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