This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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

ad. In a subtle manner; slyly; artfully; cunningly.

ad. Nicely; delicately.

ad. Deceitfully; delusively.

In a subtle manner; with subtlety.

Slyly; artfully; cunningly.

Deceitfully; delusively.

ad. in a subtle manner

"Along the way, Stubin subtly reveals how a book's index, though it looks unassuming, should be the product of long and careful thought."

slyly    artfully    cunningly    nicely    delicately