credulity vs cynicism

credulity

noun
  • Faith, credence; acceptance or maintenance of a belief. 

  • A willingness to believe in someone or something in the absence of reasonable proof; credulousness. 

cynicism

noun
  • A distrustful attitude. 

  • An emotion of jaded negativity, or a general distrust of the integrity or professed motives of other people. Cynicism can manifest itself by frustration, disillusionment and distrust in regard to organizations, authorities and other aspects of society, often due to previous bad experience. Cynics often view others as motivated solely by disguised self-interest. 

  • A skeptical, scornful or pessimistic comment or act. 

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