desolation vs unhappiness

desolation

noun
  • The state of being desolated or laid waste 

  • The act of desolating or laying waste; destruction of inhabitants; depopulation. 

  • A place or country wasted and forsaken. 

unhappiness

noun
  • The feeling of not being happy 

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