inertia vs supineness

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. 

supineness

noun
  • The state of being supine. 

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

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