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.
Learn the next connected idiom: 无济于事 (wú jì yú shì) → 事半功倍 (shì bàn gōng bèi)
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