The Collaborative International Dictionary of English v.0.48:

Apathetic \Ap`a*thet"ic\, Apathetical \Ap`a*thet"ic*al\a. [See
   Apathy.]
   Void of feeling; not susceptible of deep emotion;
   passionless. a woman who became active rather than apathetic
   as she grew older
   [1913 Webster]

   2. showing a lack of interest or concern; indifferent. an
      apathetic audience

   Syn: indifferent
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

apathetic
    adj 1: showing little or no emotion or animation; "a woman who
           became active rather than apathetic as she grew older"
    2: marked by a lack of interest; "an apathetic audience"; "the
       universe is neither hostile nor friendly; it is simply
       indifferent" [syn: apathetic, indifferent]