The word "un gentlemanlike" refers to a lack of manners, grace, or courtesy. Some antonyms for this word include "polite," "courteous," "gracious," "dignified," "chivalrous," and "refined." These words suggest a person who is well-mannered, considerate, and respectful towards others. By contrast, "un gentlemanlike" suggests that someone is rude, disrespectful, or lacking in social grace. It is important to remember that one's behavior and actions can have a significant impact on how they are perceived by others. Being a gentleman or a lady does not mean you are superior to others, it simply means that you strive to treat others with dignity and respect.