vindictively

from WordNet (r) 3.0 (2006)

vindictively
    adv 1: in a vindictive, revengeful manner; "he plotted
           vindictively against his former superiors" [syn:
           {revengefully}, {vengefully}, {vindictively}]

from The Collaborative International Dictionary of English v.0.48

Vindictive \Vin*dic"tive\, a. [For vindicative, confused with L.
   vindicta revenge, punishment, fr. vindicare to vindicate. Cf.
   {Vindicative}.]
   1. Disposed to revenge; prompted or characterized by revenge;
      revengeful.
      [1913 Webster]

            I am vindictive enough to repel force by force.
                                                  --Dryden.
      [1913 Webster]

   2. Punitive. [Obs.]
      [1913 Webster]

   {Vindictive damages}. (Law) See under {Damage}, n.
      [1913 Webster] -- {Vin*dic"tive*ly}, adv. --
      {Vin*dic"tive*ness}, n.
      [1913 Webster]