Two folks are asked the following question: "How do we best help the manatees?"
Person 1 says, "We need to focus on the supply chain."
Person 2 says, "What the hell's a manatee?"
A math professor of mine described the problem above as the "Manatee Problem" -- a problem in which the student simply doesn't even understand what's being asked, or doesn't understand the symbology of the problem.
One example word that might answer this is "Problem X is Y", where Y is the word I'm looking for.
Edit: one answer I've found is a "wicked problem", but this adjective "wicked" feels insufficient because it denotes when the constraints / obstacles to solving the problem are unclear or changing, whereas the word I'm seeking is one that communicates the knowledge necessary for the problem is pretty clear but simply unknown.