Sly

Webster's Dictionary of the English Language

·adv Slyly.

II. Sly ·vt Light or delicate; slight; thin.

III. Sly ·vt Artfully cunning; secretly mischievous; wily.

IV. Sly ·vt Done with, and marked by, artful and dexterous secrecy; subtle; as, a sly trick.

V. Sly ·vt Dexterous in performing an action, so as to escape notice; nimble; skillful; cautious; shrewd; knowing;

— in a good sense.