Source : Webster's Revised Unabridged Dictionary (1913)

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.

            I am vindictive enough to repel force by force.
                                                  --Dryden.

   2. Punitive. [Obs.]

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

Source : WordNet®

vindictive
     adj 1: disposed to seek revenge or intended for revenge; "more
            vindictive than jealous love"- Shakespeare;
            "punishments...essentially vindictive in their
            nature"- M.R.Cohen [syn: {revengeful}, {vengeful}]
     2: showing malicious ill will and a desire to hurt; motivated
        by spite; "a despiteful fiend"; "a truly spiteful child";
        "a vindictive man will look for occasions for resentment"
        [syn: {despiteful}, {spiteful}]