quondam

那位前任市长如今在大学教授历史。

The ___quondam mayor now teaches history at a university.

她前男友的出现让聚会气氛变得尴尬。

Her ___quondam boyfriend showed up and made the party awkward.

这座建筑是昔日火车站，现已被改造成博物馆。

The building, a ___quondam railway station, has been turned into a museum.