When we say someone is "singing the blues," we mean that they're feeling sad or depressed. But there are many other ways to describe this feeling. You could say someone is "down in the dumps," "in a funk," or "feeling blue." Alternatively, you might say they're "feeling low," "dejected," or "morose." They could also be "in a melancholic state," "feeling gloomy," or "going through a rough patch." Depending on the context, there may be other ways to describe this feeling, but the key is to convey a sense of sadness, hopelessness, or despair. Regardless of the language you use, it's important to be empathetic and supportive towards someone who may be going through a tough time.