Subtlely

Then the ministers and two Christian men, Theodorus and Rufinus, wrote their martyrdom and laid it subtlely among the stones.

She walked about for a moment or two in order the more thoroughly to show off her paces, and as she walked she smiled subtlely, closed her eyes demurely and managed her skirts with great dexterity.

But you must insinuate the idea very slowly and subtlely.

Never was man so subtlely flattered, so tempted.

The door sprang subtlely open unto me, and said "Go!"