archly

from WordNet (r) 3.0 (2006)

archly
    adv 1: in_an_arch_manner; with playful slyness or roguishness

from The Collaborative International Dictionary of English v.0.48

Archly \Arch"ly\, adv.
   In an arch manner; with attractive slyness or roguishness;
   slyly; waggishly.
   [1913 Webster]

         Archly the maiden smiled.                --Longfellow.
   [1913 Webster]