shameful

Shameful means feeling regret or guilt for doing something wrong or embarrassing.

When people do something they shouldn't have done, like cheat on a test or hurt someone's feelings, it can make them feel shameful. This word is often used to describe actions that are considered bad manners or behaviors that go against what's expected of you in a social situation. For example, if your friend eats the last piece of cake at a party without asking, it could be considered shameful because they didn't consider other people who wanted some too.