"Soidisant" is a French expression used to describe someone who claims to be something they are not. It can be applied to people who pretend to have a certain skill, wealth, status, or occupation. However, if you're looking for synonyms to this term, there are a few options that can convey the same meaning. For example, you could use words like "self-proclaimed," "alleged," "so-called," or "purported." Each of these options implies that the person in question is pretending to be something they are not, either intentionally or mistakenly. By using these synonyms, you can add variety to your writing and avoid repetition.