The Collaborative International Dictionary of English v.0.48:

Hedonistic \Hed`o*nis"tic\, a.
   Same as Hedonic, 2.
   [1913 Webster]

WordNet (r) 3.0 (2006):

hedonistic
    adj 1: devoted to pleasure; "a hedonic thrill"; "lives of
           unending hedonistic delight"; "epicurean pleasures" [syn:
           hedonic, hedonistic, epicurean]

Moby Thesaurus II by Grady Ward, 1.0:

59 Moby Thesaurus words for "hedonistic":
   Cyrenaic, Eleatic, Epicurean, Megarian, Stoic, animist, animistic,
   appetitive, atomistic, bent on pleasure, cosmotheistic, eclectic,
   empirical, epicurean, eudaemonic, eudaemonistic, existential,
   fun-loving, hedonic, hedonist, humanist, humanistic, idealistic,
   instrumentalist, luxurious, luxury-loving, materialistic,
   mechanistic, metaphysical, monistic, naturalistic, nominalist,
   panlogistical, pantheistic, pleasure-bent, pleasure-loving,
   pleasure-seeking, positivist, positivistic, pragmatic, pragmatist,
   rationalistic, realist, realistic, scholastic, self-indulgent,
   sensationalistic, sensual, sybaritic, syncretistic, theistic,
   transcendentalist, transcendentalistic, unchaste, utilitarian,
   vitalistic, voluntarist, voluntaristic, voluptuous