Spasmodical is an adjective that can be used to describe something that occurs in spasms or sudden bursts. There are several synonyms that can be used to describe this type of action or behavior. One synonym is irregular, which suggests that the spasms or bursts are not consistent or predictable. Another synonym is convulsive, which implies that the spasms are more violent or intense. Other synonyms include fitful, jerky, uncontrolled, and erratic. These words can be used to describe a variety of situations, such as spasmodical breathing, spasmodical movements, or spasmodical bursts of energy. When using these words, it is important to provide context and clarify the meaning of the term based on the situation.