optimism vs suspicion

optimism

noun
  • a tendency to expect the best, or at least, a favourable outcome 

  • the doctrine that this world is the best of all possible worlds 

  • the belief that good will eventually triumph over evil 

suspicion

noun
  • The act of suspecting something or someone, especially of something wrong. 

  • Uncertainty, doubt. 

  • The imagining of something without evidence. 

  • A trace, or slight indication. 

  • The condition of being suspected. 

verb
  • To suspect; to have suspicions. 

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