如果有个心烦意乱、忧心忡忡的母亲，一个完全无用的角色，那就是我。

I became a distraught, worried mother, a useless role if ever there was one.

《柯林斯英汉双解大词典》

他也给纽约警署报警并且要去其帮助，完全无用。

He also called the New York police and asked, to no avail, for help.

youdao

从表面上看，这是个不可批驳的理由，但是实际上这是完全无用的。

On the surface that seems like a great argument, but it's completely unnecessary.

youdao

Now as an aside, I'll admit this is a completely useless program, much like the first couple of ones we did because why would you write a program just to solve this?

说点题外话，我承认这是一个完全无用的程序，跟我们之前写的两个程序一样,我们为什么需要写个程序来解决这个数学运算呢？

哈佛公开课 - 计算机科学课程节选