nondescript

她穿着一件普通的灰色外套，看起来非常平凡。

She wore a ___nondescript gray jacket and looked very ordinary.

那家咖啡店是一栋不起眼的建筑，窗户很普通，也没有招牌。

The cafe was a ___nondescript building with plain windows and no signage.

这个商店卖着各种普通的商品，很难说清楚它到底是什么类型的店。

The shop sells all sorts of ___nondescript items, making it hard to tell what kind of store it really is.