The Collaborative International Dictionary of English v.0.48:

Deftly \Deft"ly\, adv. [Cf. Defly.]
   Aptly; fitly; dexterously; neatly. "Deftly dancing."
   --Drayton.
   [1913 Webster]

         Thyself and office deftly show.          --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

deftly
    adv 1: with dexterity; in a dexterous manner; "dextrously he
           untied the knots" [syn: dexterously, dextrously,
           deftly]
    2: in a deft manner; "Lois deftly removed her scarf"

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "deftly":
   ably, adeptly, adroitly, agilely, aptly, artfully, artistically,
   brilliantly, capably, cleverly, competently, cunningly,
   dexterously, dextrously, efficiently, excellently, expertly,
   featly, handily, ingeniously, masterfully, neatly, nimbly,
   proficiently, resourcefully, skillfully, spryly, superbly, well,
   with consummate skill, with finesse, with genius, with skill