Handfast is also known as an old English term, and it has a variety of synonyms. Some of the synonyms for this word are Engagement, Betrothal, Promise, Vow, Oath, Covenant, and Pledge. These synonyms signify an agreement between two individuals to be together and support each other, whether it is verbally or physically. In ancient times, handfasting was a ritual that symbolized a couple's commitment to each other. However, today, it is commonly used to refer to a temporary agreement between two people. Regardless of how it is used, the word handfast is a powerful one, symbolizing loyalty, trust, and a strong connection between two individuals.