Honestly, I still like "empty."
Plus, I would say a desire for power only for power's sake is always empty.
A desire for money only for money's sake is always empty.
A desire for fame only for fame's sake is always empty.
Those desires cannot be fulfilled and will end in frustration or, at least, a neverending quest to fulfill them.
But, for example, a desire for enough money to achieve a goal is finite and achievable.