The Collaborative International Dictionary of English v.0.48:

Tasteful \Taste"ful\ (t[=a]st"f[.u]l), a.
   1. Having a high relish; savory. "Tasteful herbs." --Pope.
      [1913 Webster]

   2. Having or exhibiting good taste; in accordance with good
      taste; tasty; as, a tasteful drapery.
      [1913 Webster] -- Taste"ful*ly, adv. --
      Taste"ful*ness, n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

tastefully
    adv 1: with taste; in a tasteful manner; "the house was
           tastefully decorated" [syn: tastefully, tastily]
           [ant: tastelessly]

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "tastefully":
   aesthetically, artistically, becomingly, decently, decorously,
   discriminately, discriminatingly, discriminatively, elegantly,
   genteelly, gracefully, in good taste, properly, quietly, seemly,
   simply, tactfully, unobtrusively, with finesse, with taste