impertinence vs lack of consideration

impertinence

noun

  • Insolence; impudence. 

  • Lack of pertinence; irrelevance. 

  • An instance of this; a moment of being impertinent. 

  • The fact or character of being out of place; inappropriateness. 

lack of consideration

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