The Collaborative International Dictionary of English v.0.48:

deluxe \deluxe\ adj.
   1. impressively expensive; notably exceeding typical price or
      quality.

   Syn: gilded, luxurious, opulent, princely, sumptuous.
        [WordNet 1.5]

   2. especially elegant and sumptuous; of the highest quality;
      as, a deluxe car; deluxe accommodations.

   Syn: gilded, luxurious, opulent, princely, sumptuous, de
        luxe, luxe, luxury(prenominal).
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

deluxe
    adj 1: rich and superior in quality; "a princely sum"; "gilded
           dining rooms" [syn: deluxe, gilded, grand,
           luxurious, opulent, princely, sumptuous]
    2: elegant and sumptuous; "a deluxe car"; "luxe accommodations"
       [syn: deluxe, de luxe, luxe]

Moby Thesaurus II by Grady Ward, 1.0:

47 Moby Thesaurus words for "deluxe":
   Babylonian, Corinthian, awe-inspiring, awful, barbaric, choice,
   dainty, delicate, elaborate, elegant, exquisite, extravagant,
   fancy, fine, glorious, grand, grandiose, imposing, impressive,
   luscious, lush, luxuriant, luxurious, magnificent, majestic, noble,
   opulent, palatial, plush, posh, princely, proud, quarry, rare,
   recherche, ritzy, splendacious, splendid, splendiferous, stately,
   sumptuous, superb, superfancy, superfine, swank, swanky, swell