Sub·tly adv. In a subtle manner; slyly; artfully; cunningly.
Thou seest how subtly to detain thee I devise. --Milton.
2. Nicely; delicately.
In the nice bee what sense so subtly true. --Pope.
Subtly communicating itself to my sensibilities, but evading the analysis of my mind. --Hawthorne.
3. Deceitfully; delusively. [Obs.]
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subtly
adv : in a subtle manner; "late nineteenth-century French opera at
its most beautiful, subtly romantic with a twilight
melancholy"