There are many synonyms available for the phrase "not regularly" that can be used to add variety to writing and speech. Some suitable alternatives include "infrequently," "sporadically," "occasionally," "intermittently," "irregularly," "inconstantly," "unpredictably," "haphazardly," and "episodically." Each of these words communicates a slightly different level of frequency, ranging from occasionally or irregularly to almost never. Choosing the most appropriate synonym to convey the intended meaning is important to ensure clear and effective communication. By utilizing synonyms, writers and speakers can avoid repetition, add interest and emphasis to their language, and more effectively convey their message.