dour

他严肃的表情让整个房间的气氛变得压抑。

His ___dour expression made the atmosphere in the room oppressive.

在阴沉的天幕下，废弃的纺织厂在光秃的山丘映衬下显得几乎有些可怖。

Under the ___dour sky, the abandoned textile mill looked almost menacing against the bare hills.

那位阴沉的图书管理员对归还的图书从不多作反应，至多一点头。

The ___dour librarian never reacts to a returned book with more than a barely perceptible nod.