pessimism vs vehemence

pessimism

noun
  • A general belief that bad things will happen. 

  • The condition of being pessimal. 

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

vehemence

noun
  • A wild or turbulent ferocity or fury. 

  • An intense concentration, force or power. 

  • Eagerness, fervor, excessive strong feeling. 

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