a.

1. 虔诚的，笃信的；敬神的
   Her mother was a pious Christian.

   她母亲是一个虔诚的基督教徒。

2. 【贬】假虔诚的，虚伪的
3. 可嘉的；好心的
4. 不可能实现的[B]
   Congress had done no more than set out some pious hopes.

   国会除了提出一些不可能实现的希望之外别无所为。

adj.

1. devoutly religious.
2. making a hypocritical display of virtue.
3. (of a hope) sincere but unlikely to be fulfilled.