1. 
[syn: impertinently, saucily, pertly, freshly, impudently]
The Collaborative International Dictionary of English v.0.48:
Impudently \Im"pu*dent*ly\, adv.
   In an impudent manner; with unbecoming assurance;
   shamelessly.
   [1913 Webster]
         At once assail
         With open mouths, and impudently rail.   --Sandys.
   [1913 Webster]
WordNet (r) 3.0 (2006):
impudently
    adv 1: in an impudent or impertinent manner; "a lean, swarthy
           fellow was peering through the window, grinning
           impudently" [syn: impertinently, saucily, pertly,
           freshly, impudently]