Source : Webster's Revised Unabridged Dictionary (1913)

Contumacious \Con`tu*ma"cious\, a. [L. contumax, -acis. See
   {Contumacy}.]
   1. Exhibiting contumacy; contemning authority; obstinate;
      perverse; stubborn; disobedient.

            There is another very, efficacious method for
            subding the most obstinate, contumacious sinner.
                                                  --Hammond.

   2. (Law) Willfully disobedient to the summous or prders of a
      court. --Blackstone.

   Syn: Stubborn; obstinate; obdurate; disobedient; perverse;
        unyielding; headstrong. -- {Con`tu*ma"cious*ly}, adv. --
        {Con`tu*ma"cious*ness}, n.

Source : WordNet®

contumaciously
     adv : in a rebellious manner; "he rejected her words rebelliously"
           [syn: {rebelliously}, {defiantly}]