extremity vs inactivity

extremity

noun
  • The most extreme or furthest point of something. 

  • A hand or foot. 

  • A limb (“major appendage of a human or animal such as an arm, leg, or wing”). 

  • An extreme measure. 

inactivity

noun
  • The quality of being inactive; idleness; passiveness. 

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