Definition
To try to do something that is very difficult or impossible to achieve, often leading to frustration and annoyance.
徒劳无功
I tried to convince him to change his mind, but it was like banging my head against a brick wall; he wouldn't listen.
我试图说服他改变主意，但就像用头撞墙一样；他根本不听。
Arguing with them about this issue is like banging your head against a brick wall; it's a complete waste of time.
和他们争论这个问题就像用头撞墙一样；完全是浪费时间。
Trying to get her to admit her mistake is like banging your head against a brick wall.
试图让她承认错误就像用头撞墙一样。