pertly

from WordNet (r) 3.0 (2006)

pertly
    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}]

from The Collaborative International Dictionary of English v.0.48

Pertly \Pert"ly\, adv.
   In a pert manner.
   [1913 Webster]