The word "unmarrying" refers to the act of ending a marriage or annulment of a marriage. There are several synonyms for this word, including divorce, separation, disunion, dissolution, and termination. Divorce and separation are perhaps the most commonly used synonyms for unmarrying, but dissolution and termination also convey the same meaning. Disunion is often used to describe the emotional separation between two people after a marriage has ended. In all, there are numerous options for expressing the idea of unmarrying, each with slight variations in connotation that can help the speaker or writer express their intentions more precisely.