promiser

The word "promiser" refers to a person who makes a promise, whether that promise is casual, serious, or solemn. It is an uncommon noun in modern everyday English, and many speakers would more naturally say "someone who made a promise" instead. In legal English, the usual form is "promisor," especially when talking about a contract. "Promiser" appears more often in general, literary, or older-style language.

The word has a narrative feel because it puts the spotlight on the speaker as the maker of the promise. In one passage, a writer might use it neutrally for a person who gives their word. In another, it may carry a critical shade, especially if the person keeps making promises without results. That is why it can fit both honorable scenes, such as a knight swearing loyalty, and doubtful ones, such as a leader known for grand pledges. Overall, "promiser" is understandable and meaningful, but it is rare enough that its tone matters: it can sound literary, old-fashioned, or mildly pointed depending on the sentence.