Source : Webster's Revised Unabridged Dictionary (1913)

Indifferent \In*dif"fer*ent\, a. [F. indiff['e]rent, L.
   indifferens. See {In-} not, and {Different}.]
   1. Not mal?ing a difference; having no influence or
      preponderating weight; involving no preference, concern,
      or attention; of no account; without significance or
      importance.

            Dangers are to me indifferent.        --Shak.

            Everything in the world is indifferent but sin.
                                                  --Jer. Taylor.

            His slightest and most indifferent acts . . . were
            odious in the clergyman's sight.      --Hawthorne.

   2. Neither particularly good, not very bad; of a middle state
      or quality; passable; mediocre.

            The staterooms are in indifferent order. --Sir W.
                                                  Scott.

   3. Not inclined to one side, party, or choice more than to
      another; neutral; impartial.

            Indifferent in his choice to sleep or die.
                                                  --Addison.

   4. Feeling no interest, anxiety, or care, respecting
      anything; unconcerned; inattentive; apathetic; heedless;
      as, to be indifferent to the welfare of one's family.

            It was a law of Solon, that any person who, in the
            civil commotions of the republic, remained neuter,
            or an indifferent spectator of the contending
            parties, should be condemned to perpetual
            banishment.                           --Addison.

   5. (Law) Free from bias or prejudice; impartial; unbiased;
      disinterested.

            In choice of committees for ripening business for
            the counsel, it is better indifferent persons than
            to make an indifferency by putting in those that are
            strong on both sides.                 --Bacon.

   {Indifferent tissue} (Anat.), the primitive, embryonic,
      undifferentiated tissue, before conversion into
      connective, muscular, nervous, or other definite tissue.

Indifferent \In*dif"fer*ent\, adv.
   To a moderate degree; passably; tolerably. [Obs.] ``News
   indifferent good.'' --Shak.

Source : WordNet®

indifferent
     adj 1: marked by a lack of interest; "an apathetic audience"; "the
            universe is neither hostile nor friendly; it is simply
            indifferent" [syn: {apathetic}]
     2: showing no care or concern in attitude or action;
        "indifferent to the sufferings of others"; "indifferent to
        her plea"
     3: (usually followed by `to') unwilling or refusing to pay
        heed; "deaf to her warnings" [syn: {deaf(p)}, {indifferent(p)}]
     4: (often followed by `to') lacking importance; not mattering
        one way or the other; "whether you choose to do it or not
        is a matter that is quite immaterial (or indifferent)";
        "what others think is altogether indifferent to him" [syn:
         {immaterial}]
     5: fairly poor to not very good; "has an indifferent singing
        voice"; "has indifferent qualifications for the job"
     6: having only a limited ability to react chemically; not
        active; "inert matter"; "an indifferent chemical in a
        reaction" [syn: {inert}, {neutral}]
     7: marked by no especial liking or dislike or preference for
        one thing over another; "indifferent about which book you
        would give them"; "was indifferent to their acceptance or
        rejection of her invitation"
     8: characterized by a lack of partiality; "a properly
        indifferent jury"; "an unbiased account of her family
        problems" [syn: {unbiased}, {unbiassed}]
     9: neither good nor bad; "an indifferent performance"; "a
        gifted painter but an indifferent actor"; "her work at the
        office is passable"; "a so-so golfer"; "feeling only
        so-so"; "prepared a tolerable dinner"; "a tolerable
        working knowledge of French" [syn: {passable}, {so-so(p)},
         {tolerable}]
     10: neither too great nor too little; "a couple of indifferent
         hills to climb"