When it comes to expressing an idea or conveying a message, it's important to have a variety of ways to say the same thing. This is why synonyms are so important. The word "semi-officially" refers to something that is done with an unofficial approval or authorization. Some synonyms that can be used instead of this term include "unofficially," "informally," "unconventionally," "unorthodoxly," "off-the-record," or "casually." Each of these words can add a slightly different shade of meaning to the original phrase depending on the context in which they are used. By having a range of synonyms to choose from, writers and speakers can better convey their ideas with precision and nuance.