OP suggests:

> Wisdom comes the closest, but it suggests a certain fustiness and grandeur, and poorly defined problems aren’t just dramatic questions like “how do you live a good life”; they're also everyday questions like “how do you host a good party” and “how do you figure out what to do today."

Part of the problem IMHO is that we make out wisdom to be this grand thing, rather than simple and effective thinking (that cannot be put into a short list of rules).

“How do you host a good party” might be ill-defined to OP, but I’m sure this is a well defined question with a good answer for a lot of people. (Let’s call that “social quotient”)