The Collaborative International Dictionary of English v.0.48:

Unruliness \Un*rul"i*ness\, n.
   Quality or state unruly.
   [1913 Webster]

WordNet (r) 3.0 (2006):

unruliness
    n 1: the trait of being prone to disobedience and lack of
         discipline [syn: unruliness, fractiousness,
         willfulness, wilfulness]