unsearchably

In fine, these men agreed that the mind, reaching back, by its very structure, to the beginning of organic life, was limited by consciousness to a comparatively small number of its potentialities, whereas its subliminal life (on the contrary) was infinite and unsearchably subtle.

The Tyranny of the Dark Hamlin Garland 1900

It is well, therefore, amongst so many irrecoverable ruins, that, in the portrait at Aix-la-Chapelle, we still possess one undoubted representation (and therefore in some degree a means for identifying _other_ representations) of a female so memorably adorned by nature; gifted with capacities so unparalleled both of doing and suffering; who lived a life so stormy, and perished by a fate so unsearchably mysterious.

Memorials and Other Papers — Complete Thomas De Quincey 1822

It is well, therefore, amongst so many irrecoverable ruins, that, in the portrait at Aix-la-Chapelle, we still possess one undoubted representation (and therefore in some degree a means for identifying _other_ representations) of a female so memorably adorned by nature; gifted with capacities so unparalleled both of doing and suffering; who lived a life so stormy, and perished by a fate so unsearchably mysterious.

Memorials and Other Papers — Volume 1 Thomas De Quincey 1822

But, secretly, I was struck with awe at the revelation of powers so unsearchably new, lurking within old affections so familiarly known as cold.

Narrative and Miscellaneous Papers Thomas De Quincey 1822

But, secretly, I was struck with awe at the revelation of powers so unsearchably new, lurking within old affections so familiarly known as cold.

Narrative and Miscellaneous Papers — Volume 2 Thomas De Quincey 1822