There are several synonyms for the word "un-juster" that can be used depending on the context. Unjust or unfair are the most common synonyms. Other synonyms include inequitable, biased, partial, discriminatory, prejudiced, and unequal. These words can be used to describe actions or situations that are not fair and unjustly favor one person or group over another. It is important to choose the correct synonym when discussing issues of justice and fairness as each word has its own connotations and implications that can affect the interpretation of the message being conveyed.