There are many different synonyms for the term "proposed marriage", each with its own unique connotations and implications. Some possible options include "engagement," which suggests a formal commitment between two partners, "betrothal," which connotes a more traditional or religious ceremony, and "promise to marry," which highlights the verbal agreement made between the couple. Other possibilities might include "proposal," "proffered hand," or "offer of union." Ultimately, the choice of term will likely depend on the context and tone of the relationship, as well as the personal preferences and values of the individuals involved.