The word "unchristian" is often used to describe behavior or beliefs that are contrary to those of Christianity, but there are many synonyms that can be used instead. Some alternatives include "unholy," "nonspiritual," "irreligious," "profane," or "godless." Each of these words has a slightly different connotation, but all suggest a departure from the values and principles held by the Christian faith. Whether you are trying to avoid using the word "unchristian" because it may be offensive, or simply looking for new ways to express yourself, these synonyms can help you communicate your ideas more effectively.