The term "un-mannered" refers to something or someone that has no manners or is uncivil. The antonyms for un-mannered are numerous and can be found in various contexts. The opposite of un-mannered can be described as considerate, polite, courteous, refined, elegant, civilized, well-behaved, cultured, gracious, sophisticated, and tactful. These antonyms all refer to the opposite of un-mannered and suggest a person who is well-versed in social etiquette and has the ability to conduct themselves with grace and decorum in any situation. Therefore, people should strive to be courteous and well-cultured to gain respect and recognition in society.