To be idle is to be motionless/inactive for some time. Yes, people can be idle. "It's pointless just to be idle" is the correct sentence. Is this the answer you're looking for?
٨ مايو ٢٠١١
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No, it is not correct. Actually I don't really know what you are trying to say here.
٨ مايو ٢٠١١
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If you mean to describe an idle person, then it doesn't make much sense.
You could simply call that person "a waste of space".