The phrase "most noncivil" implies a lack of courtesy, politeness, and civilized behavior. Its antonyms could be "most civil," "well-mannered," "courteous," "polite," and "gentlemanly/ladylike." Using these antonyms, we can create phrases to describe people who exhibit these traits, such as "he is the most civil person I know" or "she has impeccable manners and is always polite." Employing these antonyms fosters a culture of respect, tolerance, and consideration towards others, which some might argue is fundamental to a functional society. Therefore, it is important to use words that denote good behavior, as it could engender positive social norms and encourage individuals to treat each other with kindness and respect.