uncognizable

But, if a vase arose as truly existently uncognizable, then it could not be cognized even it were connected to such a universal category.

Summary of Aryadeva's Four Hundred Verses 2007

The negro, on reaching the hut where he left his mistress and her brothers, traced them through the woods, in company with his companions, until he came to the spot where their corpses laid, already putrid and uncognizable.

Perils and Captivity Comprising The sufferings of the Picard family after the shipwreck of the Medusa, in the year 1816; Narrative of the captivity of M. de Brisson, in the year 1785; Voyage of Madame Godin along the river of the Amazons, in the year 1770. Pierre Raymond de Brisson

In the second place, though matter, considered as the occult cause of our sensations, do really exist, yet what we call divisibility may be an attribute only of our sensations of sight and touch, and not of their uncognizable cause.

A System Of Logic, Ratiocinative And Inductive John Stuart Mill 1839