adverb (r)

• in an impudent or impertinent manner(adv.all)

  Example:
  A lean, swarthy fellow was peering through the window, grinning impudently.
  

  Synonym:
  freshly, impertinently, pertly, saucily
  

  source: wordnet30
• In an impudent manner; with unbecoming assurance; shamelessly.(adverb)

  source: webster1913