inertia vs slowness

inertia

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

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

  • In a person, unwillingness to take action. 

slowness

noun
  • A unit, the reciprocal of velocity, that delineates the amount of time required for an object to travel a given distance. 

  • The quality or state of being slow. 

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