The Collaborative International Dictionary of English v.0.48:

Spiritualistic \Spir`it*u*al*is"tic\, a.
   Relating to, or connected with, spiritualism.
   [1913 Webster]

WordNet (r) 3.0 (2006):

spiritualistic
    adj 1: of or relating to or connected with spiritualism [syn:
           spiritualistic, spiritualist]

Moby Thesaurus II by Grady Ward, 1.0:

32 Moby Thesaurus words for "spiritualistic":
   Berkeleian, Hegelian, Kantian, Neoplatonic, Neoplatonistic,
   Platonic, Platonistic, animist, animistic, automatist,
   clairaudient, clairsentient, clairvoyant, extrasensory, idealist,
   idealistic, immaterialist, mediumistic, panpsychist, panpsychistic,
   pretersensual, psychic, psychokinetic, psychosensory,
   second-sighted, solipsistic, spiritual, spiritualist,
   supersensible, supersensual, telekinetic, telepathic