The Collaborative International Dictionary of English v.0.48:

Contumelious \Con`tu*me"li*ous\ (?or ?; 106), a. [L.
   contumeliosus.]
   1. Exhibiting contumely; rudely contemptuous; insolent;
      disdainful.
      [1913 Webster]

            Scoffs, and scorns, and contumelious taunts. --Shak.
      [1913 Webster]

            Curving a contumelious lip.           --Tennyson.
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   2. Shameful; disgraceful. [Obs.] --Dr. H. More. --
      Con`tu*me"li*ous*ly, adv. -- Con`tu*me"li*ous*ness, n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

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