not fresh and smelling unpleasant especially because of being left slightly wet

This room smells slightly fusty - I think I'll open a window. 这个房间有些霉味——我觉得应该打开一扇窗户。

old-fashioned in ideas and beliefs

Rupert's father belongs to some fusty old gentleman's club where they don't allow women in. 鲁珀特的父亲是某个守旧的老年绅士俱乐部的会员，他们不允许女性加入。