[syn: dishonest, dishonorable]
The Collaborative International Dictionary of English v.0.48:
Dishonorable \Dis*hon"or*a*ble\, a. [Cf. F. d['e]shonorable.]
   1. Wanting in honor; not honorable; bringing or deserving
      dishonor; staining the character, and lessening the
      reputation; shameful; disgraceful; base.
      [1913 Webster]
   2. Wanting in honor or esteem; disesteemed.
      [1913 Webster]
            He that is dishonorable in riches, how much more in
            poverty!                              --Ecclus. x.
                                                  31.
      [1913 Webster]
            To find ourselves dishonorable graves. --Shak.
      -- Dis*hon"or*a*ble*ness, n. -- Dis*hon"or*a*bly, adv.
      [1913 Webster]
WordNet (r) 3.0 (2006):
dishonorable
    adj 1: lacking honor or integrity; deserving dishonor;
           "dishonorable in thought and deed" [syn: dishonorable,
           dishonourable] [ant: honorable, honourable]
    2: deceptive or fraudulent; disposed to cheat or defraud or
       deceive [syn: dishonest, dishonorable] [ant: honest,
       honorable]
Moby Thesaurus II by Grady Ward, 1.0:
91 Moby Thesaurus words for "dishonorable":
   amoral, bad, base, conscienceless, contemptible, corrupt,
   corrupted, criminal, crooked, dark, debased, degrading, derogatory,
   despicable, devious, dirty, discreditable, disgraceful, dishonest,
   disloyal, disreputable, doubtful, dubious, duplicitous, evasive,
   evil, faithless, felonious, filthy, fishy, flagrant, foul,
   fraudulent, heinous, hypocritical, ignoble, ignominious, ill-got,
   ill-gotten, immoral, improper, indirect, infamous, inglorious,
   insidious, low, mean, not kosher, notorious, objectionable,
   outrageous, perfidious, questionable, reprehensible, rotten, seamy,
   shabby, shady, shameful, shameless, shaming, shifty, shoddy,
   sinister, slippery, sordid, suspicious, traitorous, treacherous,
   tricky, two-faced, unbecoming, unconscienced, unconscientious,
   unconscionable, underhand, underhanded, unethical, unfaithful,
   unpraiseworthy, unprincipled, unrespectable, unsavory,
   unscrupulous, unseemly, unstraightforward, untrustworthy, unworthy,
   vile, without remorse, without shame