Zwinglian is an adjective used to describe someone or something related to the Swiss Reformation leader, Ulrich Zwingli. While not a frequently used term, some possible synonyms for Zwinglian might include Protestant, Reformed, Calvinist, or even simply Swiss. Additionally, terms like theologian, pastor, or reformer could be used to refer specifically to Zwingli himself. Depending on the context in which the term is being used, other synonyms that convey similar religious or historical connotations might also be appropriate. Overall, while Zwinglian may not be a common word in everyday conversation, there are a variety of possible synonyms available for those seeking to express similar concepts.