1. gloomily dark; shadowy; dimly lighted: a somber passageway.
2. dark and dull, as color, or as things in respect to color: a somber dress.
3. gloomy, depressing, or dismal: a somber mood.
4. extremely serious; grave: a somber expression on his face.
"reports can be sombre on outlooks."
"people can be sombre in evenings."
"moods can be sombre as organisations."
"effects can be sombre for viewings."
"comments can be sombre in/at/on autumns."
This list can help you learn new vocabulary more quickly and be able explore other words more easily.