"Not usually" is a phrase that means rarely, infrequently, or seldom. It is used to describe situations or actions that do not occur very often. Some synonyms for "not usually" include uncommonly, irregularly, sporadically, or occasionally. These words all convey a sense of something happening rarely or at unpredictable intervals. Additionally, other synonyms for "not usually" might include "atypical," "untypical," or "out of the ordinary," which describe things that are outside of what is considered normal or expected. Whether you use one of these synonyms or a combination of them, it will help you communicate more effectively and accurately in both verbal and written communication.