impertinent vs unmannerly

impertinent

adj

  • insolent, ill-mannered. 

  • irrelevant, useless. 

noun

  • An impertinent individual. 

unmannerly

adj

  • Not mannerly (“polite; having good manners”). 

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