Synonyms of 'convulsive'
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Something that is fitful happens for irregular periods of time or occurs at irregular times, rather than being continuous.
He drifted off into a fitful sleep.
Jerky movements are very sudden and quick, and do not flow smoothly.
He stood abruptly and left the room at a fast, jerky walk.
Thesaurus for convulsive from the Collins English Thesaurus
A convulsive movement or action is sudden and cannot be controlled.