"Illused" is a term that is not commonly used in everyday language. However, some synonyms for this word include mistreated, abused, deceived, cheated, and victimized. These words all convey a sense of wrongdoing or injustice that has been inflicted on someone. There are also more specific synonyms that can be used depending on the situation. For example, "discriminated against" could be used if the ill-treatment was due to prejudice. "Exploited" could be used if someone was taken advantage of for personal gain. Using precise synonyms can help clarify the exact nature of the ill-usage and the emotions it evokes.