The Collaborative International Dictionary of English v.0.48:

Wantonness \Wan"ton*ness\, n.
   The quality or state of being wanton; negligence of
   restraint; sportiveness; recklessness; lasciviousness.
   --Gower.
   [1913 Webster]

         The tumults threatened to abuse all acts of grace, and
         turn them into wantonness.               --Eikon
                                                  Basilike.
   [1913 Webster]

         Young gentlemen would be as sad as night
         Only for wantonness.                     --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

wantonness
    n 1: the trait of lacking restraint or control; reckless freedom
         from inhibition or worry; "she danced with abandon" [syn:
         abandon, wantonness, unconstraint]
    2: the quality of being lewd and lascivious [syn:
       licentiousness, wantonness]