Definition
To try to do something that is very difficult or impossible to achieve, often leading to frustration and annoyance.
徒劳無功
I tried to convince him to change his mind, but it was like banging my head against a brick wall; he wouldn't listen.
我試圖說服他改變主意，但就像用頭撞牆一樣；他根本不聽。
Arguing with them about this issue is like banging your head against a brick wall; it's a complete waste of time.
和他們爭論這個問題就像用頭撞牆一樣；完全是浪費時間。
Trying to get her to admit her mistake is like banging your head against a brick wall.
試圖讓她承認錯誤就像用頭撞牆一樣。