spasmodic

This term describes movements or occurrences that happen in sudden, irregular bursts rather than in a smooth or continuous flow. In a medical context, it refers specifically to involuntary muscular contractions, often associated with pain or neurological dysfunction.

When used figuratively, it describes a lack of consistency or persistence. For example, a "spasmodic effort" suggests a project that is started and stopped erratically, implying a lack of discipline or a fragmented approach. It carries a more negative or unstable connotation than words like "intermittent" or "occasional," which are more neutral.