Felonious

felonious
    adj 1: involving or being or having the nature of a crime; "a
           criminal offense"; "criminal abuse"; "felonious intent"
           [syn: {criminal}, {felonious}]
    

Felonious \Fe*lo"ni*ous\, a.
   Having the quality of felony; malignant; malicious;
   villainous; traitorous; perfidious; in a legal sense, done
   with intent to commit a crime; as, felonious homicide.
   [1913 Webster]

         O thievish Night,
         Why should'st thou, but for some felonious end,
         In thy dark lantern thus close up the stars? --Milton.
   -- {Fe*lo"ni*ous*ly}, adv. -- {Fe*lo"ni*ous*ness}, n.
   [1913 Webster]
    

86 Moby Thesaurus words for "felonious":
      actionable, against the law, amoral, anarchic, anarchistic, anomic,
      black-market, bootleg, chargeable, conscienceless, contraband,
      contrary to law, corrupt, corrupted, criminal, crooked, dark,
      devious, dishonest, dishonorable, doubtful, dubious, evasive,
      evildoing, fishy, flawed, fraudulent, ill-got, ill-gotten, illegal,
      illegitimate, illicit, immoral, impermissible, indirect,
      iniquitous, insidious, irregular, justiciable, lawless,
      malefactory, malfeasant, nonconstitutional, nonlegal, nonlicit,
      not kosher, outlaw, outlawed, punishable, questionable, rotten,
      shady, shameless, shifty, sinful, sinister, slippery, suspicious,
      triable, tricky, unallowed, unauthorized, unconscienced,
      unconscientious, unconscionable, unconstitutional,
      under-the-counter, under-the-table, underhand, underhanded,
      unethical, unlawful, unofficial, unprincipled, unsavory,
      unscrupulous, unstatutory, unstraightforward, unwarrantable,
      unwarranted, wicked, without remorse, without shame, wrong,
      wrongdoing, wrongful