adj.无益的，无用的，不愿帮助的

I'm sorry, I can't assist you with that.
对不起，我无法在那件事上帮助你。
That information is irrelevant to your question.
那个信息与你的问题无关。
I don't have any advice on that subject.
关于那个主题，我没有任何建议。
The directions you gave are incorrect.
你给的方向是错误的。
I can't provide you with the support you need.
我无法为你提供你需要的支持。
That solution won't solve the problem, it will only make it worse.
那个解决方案不会解决问题，只会使其变得更糟。
I'm too busy to help you right now.
我现在太忙了，帮不了你。
I'm not qualified to give you medical advice.
我没有资格给你医疗建议。
Your suggestion actually complicates the situation.
你的建议实际上使情况变得更复杂了。
The store is closed, there's nothing I can do.
店已经关门了，我无能为力。