cynicism vs doubtfulness

cynicism

noun
  • A skeptical, scornful or pessimistic comment or act. 

  • 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. 

doubtfulness

noun
  • The state or quality of being doubtful; doubt; uncertainty. 

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