Simple:
* The unlit hallway was dark and ominous.
* She cautiously tiptoed down the unlit hallway.
* He fumbled for the light switch in the unlit hallway.
Descriptive:
* The unlit hallway, shrouded in a thick silence, stretched out before her.
* The flickering light from the open door cast long, eerie shadows across the unlit hallway.
* The only sound in the unlit hallway was the rhythmic drip of water from a leaky faucet.
Figurative:
* The unlit hallway of her life was filled with uncertainty.
* His past was a dark, unlit hallway that he was afraid to revisit.
* The unlit hallway of their relationship was punctuated by moments of flickering hope.
You can choose the sentence that best fits the context and tone of your writing.