WordNet (r) 3.0 (2006):

scofflaw
    n 1: one who habitually ignores the law and does not answer
         court summonses

Moby Thesaurus II by Grady Ward, 1.0:

26 Moby Thesaurus words for "scofflaw":
   Judas, betrayer, convict, criminal, crook, deceiver, desperado,
   desperate criminal, double-dealer, felon, fugitive, gallows bird,
   gangster, gaolbird, jailbird, lawbreaker, mobster, outlaw,
   public enemy, quisling, racketeer, swindler, thief, thug, traitor,
   two-timer