The phrase "in wrong" typically indicates that someone is incorrect, mistaken or misguided in their beliefs or actions. There are several synonyms that can be used to convey a similar meaning. For instance, the word "erroneous" means mistaken or incorrect, whereas "misguided" implies that someone is misguided in their beliefs or actions. "Fallacious" is another synonym that means based on a false or mistaken idea. "Incorrect" and "mistaken" are more straightforward synonyms for "in wrong." Whichever word you choose to use, make sure it accurately reflects the situation and helps to deliver your intended message.