Source : Webster's Revised Unabridged Dictionary (1913)

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

            Scoffs, and scorns, and contumelious taunts. --Shak.

            Curving a contumelious lip.           --Tennyson.

   2. Shameful; disgraceful. [Obs.] --Dr. H. More. --
      {Con`tu*me"li*ous*ly}, adv. -- {Con`tu*me"li*ous*ness}, n.

Source : WordNet®

contumelious
     adj : arrogantly insolent