effrontery vs obstinence

effrontery

noun

  • An act of insolent and shameless audacity. 

  • Insolent and shameless audacity. 

obstinence

noun

  • Synonym of obstinacy; Misspelling of obstinance. 

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