We may compare Tatian's view of the soul as a subtler variety of matter.
You can also go for a subtler, more distressed looking metal.
Elizabeth, fearless almost to a fault in face of physical danger, constant in her confidence even after discovery of her narrow escape from the poisoned bullets of household conspirators, was cowardly even to a crime in face of subtler and more complicated peril.
Baldwin was a man of a subtler type - a man capable of dealing with the intrigues of a court and with problems of law, and, as such, suited for guiding the middle age of the kingdom, which the different qualities of his predecessors had been equally suited to found.
In the Vaishnava camp, on the other hand, the cult of Krishna, and more especially that of the youthful Krishna, can scarcely fail to exert an influence which, if of a subtler and more insinuating, is not on that account of a less demoralizing kind.