SPASMODIC

adj. 1 spasmodical, paroxysmal, convulsive, jerky, jerking, sudden, Technical spastic John was quite uneasy, unaware that Cynthia's spasmodic winking was due to a tic 2 fitful, irregular, intermittent, arrhythmic, random, interrupted, sporadic, erratic, occasional, periodic, unsustained, discontinuous, pulsating, cyclic(al), broken Spasmodic peals of thunder shook the house