embitter

from WordNet (r) 3.0 (2006)
embitter
    v 1: cause to be bitter or resentful; "These injustices
         embittered her even more" [syn: {embitter}, {envenom},
         {acerbate}]
from The Collaborative International Dictionary of English v.0.48
Imbitter \Im*bit"ter\, v. t. [imp. & p. p. {Imbittered}; p. pr.
   & vb. n. {Imbittering}.] [Pref. im- in + bitter. Cf.
   {Embitter}.] [Written also {embitter}.]
   To make bitter; hence, to make distressing or more
   distressing; to make sad, morose, sour, or malignant.
   [1913 Webster]

         Is there anything that more imbitters the enjoyment of
         this life than shame?                    --South.
   [1913 Webster]

         Imbittered against each other by former contests.
                                                  --Bancroft.
   [1913 Webster]
from The Collaborative International Dictionary of English v.0.48
Embitter \Em*bit"ter\, v. t.
   To make bitter or sad. See {Imbitter}.
   [1913 Webster]
from Moby Thesaurus II by Grady Ward, 1.0
80 Moby Thesaurus words for "embitter":
      acerbate, afflict, agent provocateur, aggravate, aggrieve,
      alienate, amplify, anguish, annoy, antagonize, arouse, augment,
      bitter, break down, bring to tears, bristle, build up, chafe,
      crush, cut up, damage, deepen, desolate, deteriorate, dilapidate,
      draw tears, endamage, enhance, enlarge, envenom, estrange,
      exacerbate, exasperate, fret, grieve, harm, heat up, heighten,
      hot up, huff, hurt, impair, incense, increase, inflame, infuriate,
      injure, intensify, inundate, irritate, madden, magnify, make acute,
      make worse, miff, nettle, oppress, overwhelm, peeve, pique,
      prostrate, provoke, put back, rankle, rile, roil, ruffle,
      set against, set at odds, set up, sharpen, sorrow, sour,
      stir the blood, stir up, torment, vex, weaken, work up, worsen
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