Continuous : forming an unbroken whole; without interruption.Gradual : taking place or progressing slowly or by degrees.Intermittent : occurring at irregular intervals; not continuous or steady.Spontaneous : performed or occurring as a result of a sudden impulse or inclination and without premeditation or external stimulus.Spasmodic : occurring or done in brief, irregular bursts.Synonym of Spasmodic is Intermittent