阴暗 (yīn àn): dim; dark; overcast; darkness; shadow; (fig.) dismal; gloomy; somber; murky; shadowy (side)

Both sides of this alley are high walls, and it never gets sunlight all year round, so it looks very dim.

The basement has only one small lamp, and the light is dim; I had to turn on my phone flashlight to see the stairs clearly.

That old house had been empty for years; the windows were covered with dust, and inside it was dim and damp, giving off a musty smell.