The sky was dark and dim, as if a storm were coming.
Tips
usage
Everyday use is 晦涩 (obscure, abstruse) and 隐晦 (veiled, indirect). The original meaning, the dark last day of a lunar month, survives in classical and almanac contexts.
The sun radical. The root idea is a day with no moonlight, the dark end of the lunar month, hence darkness and, by extension, anything obscure. The sun radical anchors that light-and-dark sense.
