Source : Webster's Revised Unabridged Dictionary (1913)

Dexterously \Dex"ter*ous*ly\, adv.
   In a dexterous manner; skillfully.

Source : WordNet®

dexterously
     adv : with dexterity; in a dexterous manner; "dextrously he untied
           the knots" [syn: {dextrously}, {deftly}]