表达悲伤失望情绪的英语口语

毫无办法.

It can't be helped.

There's nothing you can do about it. (这事一点儿办法都没有.)

纯属浪费时间.

It's a waste of time.

How was it? (怎么样?)

It was a waste of time talking to him. (跟他谈话,纯属浪费时间.)