The Collaborative International Dictionary of English v.0.48:

Telepathy \Te*lep"a*thy\, n. [Gr. ? far off + ?, ?, to suffer.]
   The sympathetic affection of one mind by the thoughts,
   feelings, or emotions of another at a distance, without
   communication through the ordinary channels of sensation.

   Note: The existence of this ability has not been proven
         scientifically.-- Tel`e*path"ic, a. --
         Te*lep"a*thist, n.
         [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

telepathic
    adj 1: communicating without apparent physical signals

Moby Thesaurus II by Grady Ward, 1.0:

37 Moby Thesaurus words for "telepathic":
   answering, automatist, clairaudient, clairsentient, clairvoyant,
   communicating, communicational, communional, conversational,
   extrasensory, interacting, interactional, interactive,
   intercommunicational, intercommunicative, intercommunional,
   interresponsive, interrogative, interrogatory, linguistic,
   mediumistic, oral, pretersensual, psychic, psychokinetic,
   psychosensory, questioning, responsive, second-sighted, speech,
   spiritual, spiritualistic, supersensible, supersensual,
   telekinetic, transmissional, verbal