The Collaborative International Dictionary of English v.0.48:

Delicious \De*li"cious\, a. [OF. delicieus, F. d['e]licieux, L.
   deliciosus, fr. deliciae delight, fr. delicere to allure. See
   Delight.]
   1. Affording exquisite pleasure; delightful; most sweet or
      grateful to the senses, especially to the taste; charming.
      [1913 Webster]

            Some delicious landscape.             --Coleridge.
      [1913 Webster]

            One draught of spring's delicious air. --Keble.
      [1913 Webster]

            Were not his words delicious?         --Tennyson.
      [1913 Webster]

   2. Addicted to pleasure; seeking enjoyment; luxurious;
      effeminate. [Obs.]
      [1913 Webster]

            Others, lastly, of a more delicious and airy spirit,
            retire themselves to the enjoyments of ease and
            luxury.                               --Milton.

   Syn: Delicious, Delightful.

   Usage: Delicious refers to the pleasure derived from certain
          of the senses, particularly the taste and smell; as,
          delicious food; a delicious fragrance. Delightful may
          also refer to most of the senses (as, delightful
          music; a delightful prospect; delightful sensations),
          but has a higher application to matters of taste,
          feeling, and sentiment; as, a delightful abode,
          conversation, employment; delightful scenes, etc.
          [1913 Webster]

                Like the rich fruit he sings, delicious in
                decay.                            --Smith.
          [1913 Webster]

                No spring, nor summer, on the mountain seen,
                Smiles with gay fruits or with delightful green.
                                                  --Addison.
          [1913 Webster]

WordNet (r) 3.0 (2006):

delicious
    adj 1: greatly pleasing or entertaining; "a delightful
           surprise"; "the comedy was delightful"; "a delicious
           joke" [syn: delightful, delicious]
    2: extremely pleasing to the sense of taste [syn: delectable,
       delicious, luscious, pleasant-tasting, scrumptious,
       toothsome, yummy]
    n 1: variety of sweet eating apples

Moby Thesaurus II by Grady Ward, 1.0:

98 Moby Thesaurus words for "delicious":
   OK, ace-high, adorable, agreeable, ambrosial, amusing, appetizing,
   bad, bang-up, bonzer, boss, bully, but good, charming, choice,
   comestible, cool, corking, crackerjack, dainty, dandy, darling,
   delectable, delicate, delightful, ducky, eatable, edible,
   enchanting, engaging, enjoyable, entertaining, esculent, exquisite,
   fab, fascinating, fine and dandy, flavorful, flavorsome, gear,
   good, good to eat, good-tasting, great, groovy, gustable, gusty,
   heavenly, heavy, hot, hunky-dory, jam-up, juicy, just dandy, keen,
   kosher, likable, luscious, lush, marvy, mean, mouth-watering, neat,
   nectareous, nectarous, nice, nifty, nobby, of gourmet quality,
   okay, out of sight, palatable, peachy, peachy-keen, pleasant,
   pleasing, pleasurable, rare, ripping, rum, sapid, savorous, savory,
   scrumptious, slap-up, smashing, solid, something else, spiffing,
   spiffy, stunning, succulent, swell, tasty, toothsome, tough,
   wizard, yummy