The Collaborative International Dictionary of English v.0.48:

Discontent \Dis`con*tent"\, v. t. [imp. & p. p. Discontented;
   p. pr. & vb. n. Discontenting.]
   To deprive of content; to make uneasy; to dissatisfy.
   --Suckling.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Discontent \Dis`con*tent"\, n.
   1. Want of content; uneasiness and inquietude of mind;
      dissatisfaction; disquiet.
      [1913 Webster]

            Now is the winter of our discontent
            Made glorious summer by this sun of York. --Shak.
      [1913 Webster]

            The rapacity of his father's administration had
            excited such universal discontent.    --Hallam
      [1913 Webster]

   2. A discontented person; a malcontent. [R.]
      [1913 Webster]

            Thus was the Scotch nation full of discontents.
                                                  --Fuller.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Discontent \Dis`con*tent"\ (d[i^]s`k[o^]n*t[e^]nt"), a.
   Not content; discontented; dissatisfied. --Jer. Taylor.
   [1913 Webster]

         Passion seemed to be much discontent, but Patience was
         very quiet.                              --Bunyan.
   [1913 Webster]

WordNet (r) 3.0 (2006):

discontent
    adj 1: showing or experiencing dissatisfaction or restless
           longing; "saw many discontent faces in the room"; "was
           discontented with his position" [syn: discontented,
           discontent] [ant: content, contented]
    n 1: a longing for something better than the present situation
         [syn: discontentment, discontent, discontentedness]
         [ant: contentment]
    v 1: make dissatisfied [ant: content]

Moby Thesaurus II by Grady Ward, 1.0:

116 Moby Thesaurus words for "discontent":
   aggravation, anger, angst, anguish, annoyance, anxiety, asperity,
   bad humor, bad temper, ban, be tedious, bile, biliousness,
   blackball, blackballing, bore, boredom, causticity, cheerlessness,
   choler, complaint, corrosiveness, dim view, disagreement,
   disappoint, disappointment, disapprobation, disapproval,
   discomfort, discompose, discomposure, discontentedness,
   discontentment, disenchantment, disesteem, disfavor, disgruntle,
   disgruntled, disgruntlement, dishearten, disillusion,
   disillusionment, dislike, displease, displeasure, disquiet,
   disrespect, dissatisfaction, dissatisfied, dissatisfy, dissent,
   distaste, dread, dullness, emptiness, ennui, exasperation,
   exclusion, existential woe, flatness, gall, grimness,
   humorlessness, ill humor, ill nature, ill temper, indignation,
   infelicity, infestivity, inquietude, irritation, joylessness,
   lack of pleasure, leave unsatisfied, low estimation, low opinion,
   malaise, malcontent, malcontented, mirthlessness, misery, nausea,
   nongratification, nonsatisfaction, objection, opposition, opposure,
   ostracism, painfulness, protest, put out, rejection, resentfulness,
   resentment, savorlessness, sourness, spleen, staleness,
   tastelessness, tediousness, tedium, thumbs-down, uncheerfulness,
   uncomfortableness, unease, uneasiness, ungratified, unhappiness,
   unhappy, unjoyfulness, unmirthfulness, unpleasure, unsatisfaction,
   vexation, vexation of spirit, wretchedness