Unravelable

Now though we can form no precise Idea of the Manner of its Diffusion thro’ the Nerves, or the unravellable Substance of the Brain […]

Source: wiktionary

Little or no advance, I regret to say, has as yet been made, amidst, perhaps, almost unravelable perplexities.

Source: wiktionary

In reality, while the utilitarian and ‘end-in-itself’ views may be philosophically distinct they are in fact intertwined in a complex and probably unravellable manner within the various personalities representing the competing views.

Source: wiktionary