I would suggest to change the title of the Unanswered Questions page from "Unanswered Questions" to "Unanswered Questions (questions with no answers or no upvotes yet)". Or perhaps add an asterisk and a footnote to explain what it means by "unanswered" in this case.
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We already have that, not as a footnote but as a very clear, very brightly colored subheader, as pointed by Tim Stone:
A lengthy title is never good, and since the confusion is cleared rather immediately, I see no need to change anything at this point.