There is a wide range of synonyms for the term "were wrong". Some of the most common synonyms include erroneous, mistaken, inaccurate, false, flawed, misguided, incorrect, faulty, and untruthful. Each of these words has a slightly different shade of meaning, but they all convey the same basic idea: something that was believed or asserted turned out to be incorrect. Whether the mistake was made deliberately or unintentionally, admitting and correcting it is an important part of ethical communication. Using synonyms creatively can help to expand vocabulary and make writing more expressive, but in this case, it is important to choose the right word for the context.