impertinent vs relevant

impertinent

adj

  • irrelevant, useless. 

  • insolent, ill-mannered. 

noun

  • An impertinent individual. 

relevant

adj

  • Related, connected, or pertinent to a topic. 

  • Directly related, connected, or pertinent, with important ramifications or implications. 

  • Not out of date; current. 

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