Describes a heavy, oppressive sadness or a gloomy atmosphere. Often used in literary or formal contexts to convey deep, brooding melancholy.
彼は沈鬱な表情で窓の外を見つめていた。
He stared out the window with a melancholy expression.
その小説には沈鬱な雰囲気が漂っている。
A gloomy atmosphere pervades that novel.
Compound of 沈 (sink, be submerged) and 鬱 (gloom, depression). The combination conveys a sense of sinking into melancholy.