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"
Source: WordNet® 2.0