The Collaborative International Dictionary of English v.0.48:

Contemptuously \Con*temp"tu*ous*ly\, adv.
   In a contemptuous manner; with scorn or disdain;
   despitefully.
   [1913 Webster]

         The apostles and most eminent Christians were poor, and
         used contemptuously.                     --Jer. Taylor.
   [1913 Webster]

WordNet (r) 3.0 (2006):

contemptuously
    adv 1: without respect; in a disdainful manner; "she spoke of
           him contemptuously" [syn: contemptuously,
           disdainfully, scornfully, contumeliously]