I was just about to tell someone how something "wouldn't really be much useful" if they leave it the way it is — which is like a much more polite version of useless, but I just couldn't find the word. I'm guessing I just don't know it.
What is an idiomatic euphemism for non-useful?
EDIT:
It was actually an answer to a question, and I was wondering how I would say this answer is not really useful without hurting the person.
