Adjective to describe a poorly lit unpleasant atmosphere?

Here are some adjectives to describe a poorly lit, unpleasant atmosphere:

General:

* Bleak

* Drab

* Gloomy

* Grim

* Oppressive

* Sombre

* Stark

* Unwelcoming

More specific:

* Claustrophobic (if the space feels small and enclosed)

* Dank (if there's a musty, damp smell)

* Eerie (if it feels unsettling or spooky)

* Fuggy (if there's a hazy, smoky quality)

* Murky (if the lighting is unclear and hazy)

* Shady (if it feels suspicious or dangerous)

* Suffocating (if it feels like there's not enough air)

* Tense (if there's an underlying feeling of anxiety)

The best adjective to use will depend on the specific atmosphere you want to convey.