adjective
gloomy
GLOO-mee/ˈɡluːmi/
Darkened by a lack of light.
Gloomy light from the rain-streaked window falls on the seated man.

Etymology
Gloomy probably comes from gloom, originally a “sullen look,” with an adjective ending. The connection brings darkness and human mood together: gloomy surroundings or prospects feel as cheerless as a sullen expression.
In context
what once was a dark and gloomy gym is now a bright and cozy space
More examples
- A single bare bulb lights the gloomy basement.
- The hallway grows gloomier as the sun sets.
- Even at noon, the dense forest looks gloomy.
Forms
gloomy · gloomier · gloomiest
gloom noun — Darkness caused by a lack of light.