"Menseful" is a lesser-known word that means courteous, polite, or well-mannered. However, there are several synonyms for "menseful" that can be used interchangeably. One such synonym is "civilized", which denotes someone who is polite and civilized in their behavior. Another synonym is "courteous", which highlights a person's respectful and considerate nature. Additionally, "polished" can be used as a synonym for "menseful", suggesting someone who is refined and well-mannered. Lastly, "gentlemanly" or "ladylike" can be employed to describe individuals who exhibit proper etiquette and grace. These synonyms capture the essence of "menseful", enabling people to express politeness and courtesy in versatile ways.