Given to moping; in a depressed condition, low in spirits; lackadaisical.

Is mopey a real word?

adjective, mop·i·er, mop·i·est. languishing, listless, droopy, or glum.

What does mopey mean?

given to or displaying a resentful silence and often irritability. I don't know what's made him all mopey, but he's getting hard to live with.