The Collaborative International Dictionary of English v.0.48:

Displease \Dis*please"\, v. t. [imp. & p. p. Displeased; p.
   pr. & vb. n. Displeasing.] [OF. desplaisir, whence F.
   d['e]plaisir displeasure; pref. des- (L. dis-) + plaisir to
   please. See Please, and cf. Displeasure.]
   1. To make not pleased; to excite a feeling of disapprobation
      or dislike in; to be disagreeable to; to offend; to vex;
      -- often followed by with or at. It usually expresses less
      than to anger, vex, irritate, or provoke.
      [1913 Webster]

            God was displeased with this thing.   --1 Chron.
                                                  xxi. 7.
      [1913 Webster]

            Wilt thou be displeased at us forever? --Psalms
                                                  lxxxv. 5 (Bk.
                                                  of Com.
                                                  Prayer).
      [1913 Webster]

            This virtuous plaster will displease
            Your tender sides.                    --J. Fletcher.
      [1913 Webster]

            Adversity is so wholesome . . . why should we be
            displeased therewith?                 --Barrow.
      [1913 Webster]

   2. To fail to satisfy; to miss of. [Obs.]
      [1913 Webster]

            I shall displease my ends else.       --Beau. & Fl.

   Syn: To offend; disgust; vex; annoy; dissatisfy; chafe;
        anger; provoke; affront.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Displeasing \Dis*pleas"ing\, a.
   Causing displeasure or dissatisfaction; offensive;
   disagreeable. -- Dis*pleas"ing*ly, adv. --
   Dis*pleas"ing*ness, n. --Locke.
   [1913 Webster]

WordNet (r) 3.0 (2006):

displeasing
    adj 1: causing displeasure or lacking pleasing qualities [ant:
           pleasing]

Moby Thesaurus II by Grady Ward, 1.0:

51 Moby Thesaurus words for "displeasing":
   abhorrent, annoying, bitter, bothersome, disagreeable,
   disappointing, disheartening, dislikable, dissatisfactory,
   distasteful, foul-tasting, had, ill-flavored, inadequate,
   incommensurate, insufficient, intolerable, irksome, mislikable,
   not good enough, odious, rotten, sour, thankless, ugly, unalluring,
   unappealing, unappetizing, unattractive, uncongenial, undelectable,
   undelicious, undesirable, unengaging, unenjoyable, unfulfilling,
   ungratifying, unhappy, uninviting, unlikable, unlovable,
   unpalatable, unpleasant, unpleasing, unsatisfactory, unsatisfying,
   unsavory, untasteful, untasty, unwelcome, vexing