Ununderstandableness

For the first time Desire felt that there was something about Peter which reminded her of the slow inevitableness and ununderstandableness of the ways of nature.

Source: wiktionary

Those particular threads in that particular pattern, matter extended in space in that particular formless form, the utter ununderstandableness of it all,—is felt as a counterpart to the meaningful meaninglessness of the passage of time.

Source: wiktionary

Finally, it would seem that unnaturalness does not consist in incomprehensibility or ununderstandableness, in any straightforward way.

Source: wiktionary