Source : Webster's Revised Unabridged Dictionary (1913)

Discouraging \Dis*cour"a*ging\, a.
   Causing or indicating discouragement. --
   {Dis*cour"a*ging*ly}, adv.

Discourage \Dis*cour"age\ (?; 48), v. t. [imp. & p. p.
   {Discouraged}; p. pr. & vb. n. {Discouraging}.] [Pref. dis- +
   courage: cf. OF. descoragier, F. d['e]courager: pref. des-
   (L. dis-) + corage, F. courage. See {Courage}.]
   1. To extinguish the courage of; to dishearten; to depress
      the spirits of; to deprive of confidence; to deject; --
      the opposite of encourage; as, he was discouraged in his
      undertaking; he need not be discouraged from a like
      attempt.

            Fathers, provoke not your children to anger, lest
            they be discouraged.                  --Col. iii.
                                                  21.

   2. To dishearten one with respect to; to discountenance; to
      seek to check by disfavoring; to deter one from; as, they
      discouraged his efforts.

   Syn: To dishearten; dispirit; depress; deject; dissuade;
        disfavor.

Source : WordNet®

discouraging
     adj 1: depriving of confidence or hope or enthusiasm and hence
            often deterring action; "where never is heard a
            discouraging word" [ant: {encouraging}]
     2: expressing disapproval