The Collaborative International Dictionary of English v.0.48:

Delightful \De*light"ful\, a.
   Highly pleasing; affording great pleasure and satisfaction.
   "Delightful bowers." --Spenser. "Delightful fruit." --Milton.

   Syn: Delicious; charming. See Delicious. --
        De*light"ful*ly, adv. -- De*light"ful*ness, n.
        [1913 Webster]

WordNet (r) 3.0 (2006):

delightfully
    adv 1: in a delightful manner; "the farm house, though in itself
           a small one, is delightfully situated"

Moby Thesaurus II by Grady Ward, 1.0:

19 Moby Thesaurus words for "delightfully":
   appealingly, bewitchingly, charmingly, enchantingly, engagingly,
   enravishingly, entrancingly, exquisitely, fascinatingly,
   intriguingly, invitingly, luxuriously, ravishingly, sensuously,
   tantalizingly, temptingly, voluptuously, winningly, winsomely