The antonyms for the word "are courteous" are rude, impolite, discourteous, disrespectful, and uncivil. When you encounter individuals who exhibit these characteristics, it can be quite unsettling, and the interaction may not go well. Ignoring the common courtesies that flow between two people is not justifiable. It's vital to treat others with respect and dignity, and this forms the basis of interactions. The use of courteous expressions, tone, and behavior can go a long way in creating a pleasant and harmonious environment. On the other hand, choosing to be rude only leads to confrontations, misunderstandings, and rifts, and it's not a preferable attitude to possess.