The phrase "make gloomy" can be replaced with a variety of synonyms depending on the context. Here are a few options: "Cast a pall over," "Dampen spirits," "Bring down," "Depress," "Sadden," or "Reduce to darkness." Each of these synonyms captures the idea of making something or someone feel dark, dreary, or sad. Whether describing a rainy day that casts a pall over a family vacation or a poignant scene in a novel that dampens spirits, there are many times when it's useful to have various options for expressing a gloomy feeling. Choosing the right synonym can add depth and nuance to your writing, helping your readers to connect more deeply with your words.