When considering synonyms for the term "ban-mannered," one could use words such as impolite, ill-mannered, rude, discourteous, or disrespectful. These words describe someone who shows a lack of social graces, often behaving in an inappropriate or offensive manner. Other synonyms for "ban-mannered" could include uncivil, boorish, unmannerly, vulgar, or offensive. Such individuals may demonstrate a lack of consideration for others' feelings or exhibit poor judgment and decision-making skills. It is important to note that behavior deemed as "ban-mannered" can vary depending on cultural and societal standards, but overall, it is generally viewed as being unpleasant or offensive.