na-adjective
Describes a dark, depressing atmosphere or a person's low-spirited mood. Used as a na-adjective.
今日は天気がグルーミーで、気分も沈みがちだ。
The weather is gloomy today, and I tend to feel down.
彼はグルーミーな表情で部屋に入ってきた。
He came into the room with a gloomy expression.