caution vs impertinence

caution

noun
  • A formal warning given as an alternative to prosecution in minor cases. 

  • Security; guaranty; bail. 

  • A yellow card. 

  • Prudence when faced with, or when expecting to face, danger; care taken in order to avoid risk or harm. 

  • A careful attention to the probable effects of an act, in order that failure or harm may be avoided. 

verb
  • To warn; to alert, advise that caution is warranted. 

  • To give a yellow card 

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. 

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