Subtilties [noun]

But thy eyes were too penetrating not to detect the subtilty.

If he can secure any suggestion of the subtilty and luminousness,—if he can!

He says of the sorcerer that he is a child of the devil and full of subtilty.

But in both these letters we see the subtilty and caution of the writers.

I see no reason to qualify this moderation as subtilty, which Mills has not scrupled to do.

There being no enquiry that does more entice with the probability and deceive with the subtilty.

For Seneca says, nothing is more odious than subtilty when it is only subtilty.

What presence of mind, what subtilty, what truth, in his replies!

Quiddit, kwid′it, n. an equivocation: a subtilty or quibble.

But this seems to me a subtilty that is not discoverable in nature.