When it comes to antonyms for the word "more bad-mannered", there are a few different options to consider. One possibility is "well-mannered", which refers to someone who has good manners and behaves appropriately in social situations. Another option could be "polite", which means showing consideration and respect for others. Other antonyms for "more bad-mannered" might include "courteous", "gentlemanly", "ladylike", "gracious", "civil", or "cultured". Ultimately, the choice of antonym will depend on the specific context and tone you are trying to convey, as well as the nuances of the word "bad-mannered" itself.