impudent vs prudent

impudent

adj
  • Not showing due respect; impertinent; bold-faced. 

prudent

adj
  • Frugal, economical. 

  • Sagacious in adapting means to ends; circumspect in action, or in determining any line of conduct. 

  • Practically wise, judicious, shrewd. 

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