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Synonyms for Artful (same or very similar meaning)

WordNet sense 1 (not straightforward or candid; giving a false appearance of frankness):

WordNet sense 2 (cunning and sly):

WordNet sense 3 (concealing crafty designs for advancing your own interest):

WordNet sense 4 (marked by skill in deception):
crafty, cunning, slick, sly, tricky, wily

WordNet sense 5 (skillful (or showing skill) in adapting means to ends):
adroit, clever, ingenious

From the ODE community, based on WordNetadd/edit