Source : Webster's Revised Unabridged Dictionary (1913)

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.

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

Source : WordNet®

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"