neutrality vs unconcern

neutrality

noun
  • The quality or state of being neutral. 

  • The state or quality of being neutral; the condition of being unengaged in contests between others; state of taking no part on either side. 

  • The condition of a nation or government which refrains from taking part, directly or indirectly, in a war between other powers. 

  • Those who are neutral; a combination of neutral powers or states. 

unconcern

noun
  • Freedom from worry or apprehensiveness; insouciance or nonchalance. 

  • Lack of interest or care; indifference or apathy. 

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