The word "shows courtesy" refers to being polite and respectful in your behavior towards others. Antonyms for this word would be the opposite of showing courtesy, such as being rude, disrespectful, impolite, or inconsiderate. When you don't exhibit courteous behavior, you may come across as aggressive, uncaring, or selfish, which can harm your relationships and reputation over time. Being courteous is an essential aspect of good manners, and it helps to build trust and respect between individuals. Remember, the way you treat others reflects your personality and defines the type of person you are, so always strive to exhibit courteous behavior.