subtly

Meanings

1. 1
   adv

   in a subtle manner

   late nineteenth-century French opera at its most beautiful, subtly romantic with a twilight melancholy

2. 2
   adv

   With subtleness, in a subtle manner; with cleverness rather than brute force.

   Nexte cometh Arrius by ſoo muche the more wretched and madde in opynyon, by howe muche he dothe more ſubtely and craftily geue unto Chriſt the body of a man, and taketh from hym the ſowle of a man, […]

Etymology

From Middle English sotilly; equivalent to subtle + -ly.