无济于事 (wú jì yú shì): Be of no avail / to no avail — Meaning & Stroke Order

In the face of such a complex system failure, any temporary remedial measures are of no avail.

You're only feeling regret now, don't you think it's already of no avail?

Without fundamental reform, these superficial adjustments will ultimately be of no avail.

He tried to make up for his daytime laziness by staying up late, but this was completely of no avail.