frustrate|frustrated|frustrating

看着宝贵的时间被浪费真是令人沮丧。

It's ___frustrating to watch valuable time being wasted.

处理过时的技术是一种令人沮丧的情况。

Dealing with outdated technology is a ___frustrating situation.

我对改革进展缓慢越来越感到沮丧。

I'm growing increasingly ___frustrated at the slow pace of reform.