"Unsubscribe" is a term most commonly used in reference to opting out of an email or subscription list. However, there are numerous synonyms that can be used in its place. For example, "opt-out" or "remove" can be used to convey the same meaning. Other options include "cancel" or "withdraw," which are also commonly used in the context of subscription services or membership programs. Additionally, "unsubscribe" can be replaced with more formal language such as "terminate," "rescind," or "nullify." No matter which synonym is used, the message remains clear - the recipient wishes to end their relationship with the sender.