Source : Webster's Revised Unabridged Dictionary (1913)

Disinterested \Dis*in"ter*est*ed\, a. [Cf. {Disinteressed}.]
   Not influenced by regard to personal interest or advantage;
   free from selfish motive; having no relation of interest or
   feeling; not biased or prejudiced; as, a disinterested
   decision or judge.

         The happiness of disinterested sacrifices. --Channing.

   Syn: Unbiased; impartial; uninterested; indifferent.

Source : WordNet®

disinterested
     adj : unaffected by self-interest