The term "un-politer" can be described in a few different ways. One antonym for the word would be "rude," which implies a lack of manners, consideration, or kindness. Another potential antonym could be "impolite," which suggests a failure to adhere to societal norms or expectations regarding behavior, communication, or decorum. Other possible antonyms might include "discourteous," "uncivil," "insolent," or "disrespectful." Ultimately, the antonyms for "un-politer" all point towards behaviors or attitudes that are the opposite of polite, suggesting a lack of respect or consideration for others, or a failure to abide by established social protocols.