Antonyms for the word "more foul-mouthed" can be "polite," "courteous," "respectful," "civil," "decorous," "refined," "dignified," "well-mannered," or "gentlemanly/ladylike." Using these antonyms, we can express the opposite of someone who is vulgar, crude, or offensive with their language. Being polite and respectful in your speech is an essential component of effective communication and healthy relationships, regardless of the context. It is important to be mindful of the words we use and their impact on others. By avoiding foul language and instead choosing polite, courteous words and phrases, we can cultivate a culture of respect and civility in our interactions with others.