Daily Chinese Idiom Guessing Game
It is of no help or use; futile.
济补益，帮助。对事情没有什么帮助或益处。比喻不解决问题。
清·李宝嘉《官场现形记》第五十二回如今远水救不得近火，就是我们再帮点忙，至多再凑了几百银子，也无济于事。”
He tried to fix the broken vase with glue, but it was 无济于事.