Source : Webster's Revised Unabridged Dictionary (1913)

Unlawful \Un*law"ful\, a.
   Not lawful; contrary to law. -- {Un*law"ful*ly}, adv. --
   {Un*law"ful*ness}, n.

   {Unlawful assembly}. (Law) See under {Assembly}.

Source : WordNet®

unlawfulness
     n : the quality of failing to conform to law [ant: {lawfulness}]