insolence vs obstinence

insolence

noun
  • Arrogant conduct; insulting, bold behaviour or attitude. 

  • Insolent conduct or treatment; insult. 

obstinence

noun
  • Synonym of obstinacy; Misspelling of obstinance. 

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