terror vs unconcern

terror

noun
  • Intense dread, fright, or fear. 

  • The action or quality of causing dread; terribleness, especially such qualities in narrative fiction. 

  • A night terror. 

  • Terrorism. 

  • Something or someone that causes such fear. 

unconcern

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

  • Lack of interest or care; indifference or apathy. 

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