inertness vs slothfulness

inertness

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

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

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

slothfulness

noun
  • The state or quality of being slothful. 

  • The result or product of being slothful. 

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