insincerity vs pretense

insincerity

noun
  • Property of being insincere, lacking sincerity or truthfulness. 

pretense

noun
  • Intention or purpose not real but professed. 

  • An insincere attempt to reach a specific condition or quality. 

  • A false or hypocritical profession 

  • An unsupported claim made or implied. 

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