subtilty

Or of the subtilty of owls, which husband their store of mice by biting off their feet, so that they cannot run away?

Now in this latter attempt, the subtilty of his circumvention, hath indirectly obtained the former.

Let him rally all the ability, learning, and subtilty which he can command, and undertake the impossible work.

In the second, he is grown a little more careful and guarded,—the effect of subtilty.