The Collaborative International Dictionary of English v.0.48:
Contemptuousness \Con*temp"tu*ous*ness\, n. Disposition to or manifestion of contempt; insolence; haughtiness. [1913 Webster]WordNet (r) 3.0 (2006):
contemptuousness n 1: the manifestation of scorn and contempt; "every subordinate sensed his contemptuousness and hated him in return"