Source : Webster's Revised Unabridged Dictionary (1913)

Dispassionate \Dis*pas"sion*ate\, a.
   1. Free from passion; not warped, prejudiced, swerved, or
      carried away by passion or feeling; judicial; calm;
      composed.

            Wise and dispassionate men.           --Clarendon.

   2. Not dictated by passion; not proceeding from temper or
      bias; impartial; as, dispassionate proceedings; a
      dispassionate view.

   Syn: Calm; cool; composed serene; unimpassioned; temperate;
        moderate; impartial; unruffled. --
        {Dis*pas"sion*ate*ly}, adv. -- {Dis*pas"sion*ate*ness},
        n.

Source : WordNet®

dispassionately
     adv : in an impartially dispassionate manner; "although he was
           looking at the other girl, he did so dispassionately"