When it comes to describing people who claim to be something they are not, "most soi-disant" is just one option. There are a variety of synonyms that can be used instead, including "self-proclaimed," "so-called," "pretended," "alleged," and "supposed." Each of these words offers a slightly different shade of meaning, but all point to someone who is making a claim without necessarily having the credentials or proof to back it up. Whether you're talking about self-proclaimed experts, so-called celebrities, or supposed insiders, there are plenty of ways to express skepticism about their claims.