pessimism vs wretchedness

pessimism

noun
  • The condition of being pessimal. 

  • A general belief that bad things will happen. 

  • The doctrine that this world is the worst of all possible worlds. 

wretchedness

noun
  • A state of prolonged misfortune, privation, or anguish. 

  • An unhappy state of mental or physical suffering. 

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