CONVULSIVE
convulsive, spasmodic, spastic
(adjective) affected by involuntary jerky muscular contractions; resembling a spasm; “convulsive motions”; “his body made a spasmodic jerk”; “spastic movements”
convulsive
(adjective) resembling a convulsion in being sudden and violent; “a convulsive rage”; “convulsive laughter”
Source: WordNet® 3.1
Etymology
Adjective
convulsive (comparative more convulsive, superlative most convulsive)
Marked by or having the nature of convulsions.
Having or producing convulsions.
Source: Wiktionary
Con*vul"sive, a. Etym: [Cf. F. convulsif.]
Definition: 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: Webster’s Unabridged Dictionary 1913 Edition