"What a gloomy day. It makes me feel blue."
"Whenever I feel blue, I like to listen to upbeat music."
"Matt's feeling a little blue right now. Let's go cheer him up."
A: "Where is Matt these days? I haven't seen him in a while."
B: "He feels a little blue because he can't find a girlfriend."
A: "Let's go cheer him up."
Other Common Sentences
"I feel a little depressed right now."
"I don't know why, but I just feel sad."
"Even though it's a nice day, I feel gloomy inside."