The Collaborative International Dictionary of English v.0.48:

Uninterested \Un*in"ter*est*ed\, a.
   1. Not interested; not having any interest or property in;
      having nothing at stake; as, to be uninterested in any
      business.
      [1913 Webster]

   2. Not having the mind or the passions engaged; as,
      uninterested in a discourse or narration.
      [1913 Webster]

WordNet (r) 3.0 (2006):

uninterested
    adj 1: not having or showing interest; "an uninterested
           spectator" [ant: interested]
    2: having no care or interest in knowing; "she appeared totally
       uninterested"