subtly

Etymology

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

adv

1. With subtleness, in a subtle manner; with cleverness rather than brute force.
   As the world's drug habit shows, governments are failing in their quest to monitor every London window-box and Andean hillside for banned plants. But even that Sisyphean task looks easy next to the fight against synthetic drugs. No sooner has a drug been blacklisted than chemists adjust their recipe and start churning out a subtly different one. 2013-08-10, “A new prescription”, in The Economist, volume 408, number 8848