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"