Wiktionary
unknowability
n. The quality or state of being unknowable.
Usage examples of "unknowability".
But the mass and variety of duncical activity obscures the significance of their individual activity, and therefore one of the consequences of the abstraction and unknowability of Dulness is that the situation is beyond individual control.
What did that say about the unknowability and unfathomability of the gods-assuming they even existed?