Mense is a somewhat archaic term that dates back to Middle English, and is used to describe a person or a group of people. It is mostly used in the context of describing manners, behavior, or actions. Some synonyms that can be used instead of mense are courtesy, decorum, civility, and refinement. Each of these words conveys a sense of respect, politeness, and proper conduct, which are often associated with good manners. Other synonyms include culture, elegance, grace, and suavity, which suggest a more sophisticated and polished demeanor. In any case, using any of these words instead of mense can help add variety and nuance to your speech or writing.