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):

delightful
    adj 1: greatly pleasing or entertaining; "a delightful
           surprise"; "the comedy was delightful"; "a delicious
           joke" [syn: delightful, delicious]

Moby Thesaurus II by Grady Ward, 1.0:

83 Moby Thesaurus words for "delightful":
   adorable, agreeable, alluring, ambrosial, amusing, appealing,
   attractive, beautiful, beguiling, bewitching, captivating,
   charming, congenial, dainty, darling, delectable, delicate,
   delicious, diverting, enchanting, engaging, enjoyable, enravishing,
   entertaining, enthralling, entrancing, exciting, exquisite, fair,
   fascinating, fetching, fun, good, good to eat, good-tasting,
   gratifying, gustable, gusty, heart-robbing, heavenly, humorous,
   ineffable, intriguing, inviting, irresistible, joyful, juicy,
   likable, lovely, luscious, lush, luxurious, nectareous, nectarous,
   nice, of gourmet quality, palatable, pleasant, pleasing,
   pleasurable, prepossessing, ravishing, recreational, sapid,
   satisfying, savorous, savory, scrumptious, sensuous, succulent,
   taking, tantalizing, tasty, tempting, thrilling, titillating,
   titillative, toothsome, voluptuous, winning, winsome, witching,
   yummy