How To Describe People Diligent - When you care a lot about your work or duty. “My students are diligent when doing their homework.” Cheerful - When you are very happy and optimistic. “How are you always so cheerful in the morning?” Depressed - When you are very unhappy and don’t know how to get out of it. “She looks so lonely and depressed.” Messy - Untidy or dirty “His bedroom is so messy.” Polite - When you show respect and consideration to other people. “I was too polite to tell them they were wrong.”