The antonyms for the phrase "was courteous" are rudeness, impoliteness, discourtesy, incivility, and disrespect. When someone lacks manners and exhibits a disregard for common courtesies, they are considered impolite. They may be careless with their speech and actions, failing to show consideration for others. This behaviour can often lead to misunderstandings and conflicts. On the other hand, when someone is courteous, they display good manners and respect for others. They show kindness, patience, and consideration, making others feel valued and comfortable. Politeness is an essential aspect of effective communication and building positive relationships with others.