vô ích Englisch:

a futile attempt/effort; it is futile to do something

I did my best to learn to dance but all my attempts proved futile.

Going to the local police for help is often futile

But so far as I can see, thinking about such things is not futile.

It's completely futile trying to reason with him - he just won't listen.

It just seems so futile, you know? All these women and nothing!

Although stoichiometrically possible, these modes involve futile cycling of carbon across the internal membranes to dissipate energy

No sooner had I Fixed the washmashine than it turned out that my effort was futile

... later years on a futile search for a unified...

Such a fight would be both futile and ridiculous.

It isn't futile to go to university.

If one plants an oak, it is futile to hope to soon be able to take cover under its leaves.