1) Faintly 2) Finely 3) On the qt 1) How irony may be presented 2) In a delicate manner 3) In a subtle manner 4) In an ingenious manner 5) With understatedness 6) Without blatancy 
• (adv.) Deceitfully; delusively. • (adv.) Nicely; delicately. • (adv.) In a subtle manner; slyly; artfully; cunningly.
Sub'tly adverb 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 it...
[adv] - in a subtle manner
subtly 1. In a manner that has or is marked by keen insight and the ability to penetrate deeply and thoroughly. 2. In a subtle manner; slyly; artfully; cunningly.
adverb in a subtle manner; `late nineteenth-century French opera at its most beautiful, subtly romantic with a twilight melancholy`