うすぐら薄暗usugurai
1.

Describing an environment that has insufficient light, leading to a sense of obscurity or lack of clarity, making it feel somewhat gloomy or unsettling.

2.

Referring to a situation where the lighting is low enough to be uncomfortably dark, often experienced during certain times of the day or in certain seasons, reducing visibility and contributing to a dreary atmosphere.

3.

Characterizing a space that is not brightly lit, creating a feeling of somberness or subdued ambiance, suitable for evoking a contemplative or introspective mood.

Example:

薄暗い光の中で彼の顔を見た。