When a situation or event happens repeatedly, it is called recurrent. However, there are many other synonyms that can be used to describe the same thing. Some examples of such synonyms include repetitive, persistent, continuous, ongoing, and frequent. These words imply that something is happening again and again, and that it is a regular occurrence. Other possible synonyms for "recurrent" could include regular, routine, habitual, or periodic. Each of these words has a slightly different connotation and can be used to describe different types of situations, but all of them convey the idea of something that happens repeatedly over time.