The Collaborative International Dictionary of English v.0.48:

Lawless \Law"less\, a.
   1. Contrary to, or unauthorized by, law; illegal; as, a
      lawless claim.
      [1913 Webster]

            He needs no indirect nor lawless course. --Shak.
      [1913 Webster]

   2. Not subject to, or restrained by, the law of morality or
      of society; as, lawless men or behavior.
      [1913 Webster]

   3. Not subject to the laws of nature; uncontrolled.
      [1913 Webster]

            Or, meteorlike, flame lawless through the void.
                                                  --Pope.
      -- Law"less*ly, adv. -- Law"less*ness, n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

lawlessness
    n 1: a state of lawlessness and disorder (usually resulting from
         a failure of government) [syn: anarchy, lawlessness]
    2: illegality as a consequence of unlawful acts; defiance of the
       law [syn: lawlessness, outlawry]

Moby Thesaurus II by Grady Ward, 1.0:

59 Moby Thesaurus words for "lawlessness":
   anarchy, anomie, assumption, chaos, civil disobedience, conflict,
   contention, criminalism, criminality, difference, discord,
   disobedience, dissension, familiarity, frowardness, hubris,
   illegality, illicit business, illicitness, impermissibility,
   imposition, indiscipline, indocility, infraction, infringement,
   insubordination, intractability, lawbreaking, legal flaw,
   liberties, liberty abused, license, licentiousness, mobocracy,
   naughtiness, noncompliance, nonconformity, noncooperation,
   nonobedience, ochlocracy, outlawry, passive resistance,
   presumption, presumptuousness, recusancy, strife, technical flaw,
   transgression, uncooperativeness, undue liberty, unduteousness,
   undutifulness, unlawfulness, unsubmissiveness, variance, violation,
   waywardness, willful disobedience, wrongfulness