[W/K] :: illegal

  Illegal \Il*le"gal\, a. [Pref. il- not + legal: cf. F.
     ill['e]gal.]
     Not according to, or authorized by, law; specif., contrary
     to, or in violation of, human law; unlawful; illicit; hence,
     immoral; as, an illegal act; illegal trade; illegal love.
     --Bp. Burnet.
     [1913 Webster]

  illegal
       adj : prohibited by law or by official or accepted rules; "an
             illegal chess move" [ant: legal]

  105 Moby Thesaurus words for "illegal":
     aberrant, abnormal, abominable, actionable, against the law,
     anarchic, anarchistic, anomic, atrocious, banned, barred,
     black-market, bootleg, chargeable, contraband, contrary to law,
     criminal, delinquent, deviant, disgraceful, evil, felonious,
     flawed, forbade, forbid, forbidden, hardly the thing, hot,
     ignominious, illegitimate, illicit, impermissible, improper,
     inappropriate, incorrect, indecorous, inequitable, infamous,
     iniquitous, interdicted, irregular, justiciable, lawless,
     nonconstitutional, nonlegal, nonlicit, nonpermissible, not done,
     not permitted, not the thing, off limits, off-base, off-color,
     out of bounds, out-of-line, outlaw, outlawed, prohibited,
     proscribed, punishable, ruled out, sacrilegious, scandalous,
     shameful, shameless, sinful, taboo, tabooed, terrible, triable,
     unallowed, unauthorized, unbalanced, unconstitutional,
     under the ban, under-the-counter, under-the-table, undeserved,
     undue, unequal, unequitable, uneven, unfit, unfitting, unjust,
     unlawful, unlicensed, unmeet, unmerited, unofficial, unpermissible,
     unrighteous, unrightful, unsanctioned, unseemly, unstatutory,
     unsuitable, untouchable, unwarrantable, unwarranted, verboten,
     vetoed, wicked, wrong, wrongful
  
  

  ILLEGAL. Contrary to law; unlawful.
       2. It is a general rule, that the law will never give its aid to a 
  party who has entered into an illegal contract, whether the same be in 
  direct violation of a statute, against public policy, or opposed to public 
  morals. Nor to a contract which is fraudulent, which affects the defendant 
  or a third person. 
       3. A contract in violation of a statute is absolutely void, and, 
  however disguised, it will be set aside, for no form of expression can 
  remove the substantial defect inherent in the nature of the transaction; the 
  courts will investigate the real object of the contracting parties, and if 
  that be repugnant to the law, it will vitiate the transaction. 
       4. Contracts against the public policy of the law, are equally void as 
  if they were in violation of a public statute; a contract not to marry any 
  one, is therefore illegal and void. See Void. 
       5. A contract against the purity of manners is also illegal; as, for 
  example, a agreement to cohabit unlawfully with another, is therefore void; 
  but a bond given for past cohabitation, being considered as remuneration for 
  past injury, is binding. 4 Bouv. Inst. n. 3853. 
       6. All contracts which have for their object, or which may in their 
  consequences, be injurious to third persons, altogether unconnected with 
  them, are in general illegal and void. Of the first, an example may be found 
  in the case where a sheriff's officer received a sum of money from a 
  defendant for admitting to bail, and agreed to pay the bail, part of the 
  money which was so exacted. 2 Burr. 924. The case of a wager between two 
  persons, as to the character of a third, is an example of the second class. 
  Cowp. 729; 4 Camp. 152; 1 Rawle, 42; 1 B. & A. 683. Vide Illicit; Unlawful.