When we hear the term "not allowed," we usually understand it as something that is prohibited. But this can be expressed in different ways using synonyms. For instance, another way to say "not allowed" is "prohibited," which means that something is forbidden or not permitted. Similarly, the term "restricted" implies that something has limitations or is confined within certain parameters. We can also use the phrase "forbidden" or "banned," which indicate that an act or behavior is strictly not permissible. Additionally, "unauthorized" refers to a lack of permission or approval to do something. In summary, there are various ways to express "not allowed," depending on the context and the desired tone.