The state, property or quality of being hidden.(noun)
The result or product of being hidden.(noun)
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Use "hiddenness" in a sentence
"Another factor to the prophecy is the "hiddenness" of Mary as a virgin that St. Jerome mentioned above."
"Each says something about our separations and yearning for reunion: web of life; mystery, hiddenness; creation crucified; putting "eco" back in economics; nature adapts, we can too; wilderness in nature, wildness of love; and nature as friend."
"Given the level of intricacy and complexity that defines our biology and our growth potential, as with so many creatures, importance should be granted to mystery and hiddenness."