The Collaborative International Dictionary of English v.0.48:

Dishonest \Dis*hon"est\, v. t. [Cf. OF. deshonester.]
   To disgrace; to dishonor; as, to dishonest a maid. [Obs.]
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         I will no longer dishonest my house.     --Chapman.
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The Collaborative International Dictionary of English v.0.48:

Dishonest \Dis*hon"est\, a. [Pref. dis- + honest: cf. F.
   d['e]shonn[^e]te, OF. deshoneste.]
   1. Dishonorable; shameful; indecent; unchaste; lewd. [Obs.]
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            Inglorious triumphs and dishonest scars. --Pope.
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            Speak no foul or dishonest words before them [the
            women].                               --Sir T.
                                                  North.
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   2. Dishonored; disgraced; disfigured. [Obs.]
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            Dishonest with lopped arms the youth appears,
            Spoiled of his nose and shortened of his ears.
                                                  --Dryden.
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   3. Wanting in honesty; void of integrity; faithless; disposed
      to cheat or defraud; not trustworthy; as, a dishonest man.
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   4. Characterized by fraud; indicating a want of probity;
      knavish; fraudulent; unjust.
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            To get dishonest gain.                --Ezek. xxii.
                                                  27.
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            The dishonest profits of men in office. --Bancroft.
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WordNet (r) 3.0 (2006):

dishonest
    adj 1: deceptive or fraudulent; disposed to cheat or defraud or
           deceive [syn: dishonest, dishonorable] [ant:
           honest, honorable]
    2: capable of being corrupted; "corruptible judges"; "dishonest
       politicians"; "a purchasable senator"; "a venal police
       officer" [syn: corruptible, bribable, dishonest,
       purchasable, venal]

Moby Thesaurus II by Grady Ward, 1.0:

101 Moby Thesaurus words for "dishonest":
   Machiavellian, ambidextrous, amoral, artful, bent, casuistic,
   cheating, conscienceless, corrupt, corrupted, counterfeit, crafty,
   criminal, cronk, crooked, cunning, dark, deceitful, deceiving,
   deceptive, defrauding, devious, dishonorable, disingenuous, double,
   double-dealing, double-faced, double-minded, double-tongued,
   doublehearted, doubtful, dubious, duplicitous, empty, equivocal,
   evasive, faithless, fake, false, false-principled, falsehearted,
   felonious, fishy, forsworn, fraudulent, furtive, hollow,
   hypocritical, ill-got, ill-gotten, immoral, indirect, insidious,
   insincere, jesuitic, knavish, lying, mealymouthed, mendacious,
   not kosher, oblique, perfidious, perjured, prevaricating,
   questionable, roguish, rotten, shady, shameless, shifty, sinister,
   slippery, snide, suspicious, swindling, thieving, thievish,
   tongue in cheek, treacherous, tricky, truthless, two-faced,
   uncandid, unconscienced, unconscientious, unconscionable,
   underhand, underhanded, unethical, unfair, unfrank, unprincipled,
   unsavory, unscrupulous, unserious, unstraightforward,
   untrustworthy, untruthful, unveracious, without remorse,
   without shame