In an attractive manner:
— How cunningly the olive-green dress with its underskirt of rose-brocade fitted her perfect figure.

synonym: cutely.

In an artful manner:
— Had ever circumstances conspired so cunningly?.

synonyms: artfully, craftily, foxily, knavishly, slyly, trickily.

Roget 702: cunningly etc. adj.; slyly, slily^†, on the sly, by a side wind.