Source : Webster's Revised Unabridged Dictionary (1913)

Convulsive \Con*vul"sive\, a. [Cf. F. convulsif.]
   Producing, or attended with, convulsions or spasms;
   characterized by convulsions; convulsionary.

         An irregular, convulsive movement may be necessary to
         throw off an irregular, convulsive disease. --Burke.

Source : WordNet®

convulsive
     adj 1: affected by involuntary jerky muscular contractions;
            resembling a spasm; "convulsive motions"; "his body
            made a spasmodic jerk"; "spastic movements" [syn: {spasmodic},
             {spastic}]
     2: resembling a convulsion in being sudden and violent; "a
        convulsive rage"; "convulsive laughter"