1) In a crafty way 2) In a mischievous manner 3) In a mischievous way 4) In an arch manner 5) In an arch or roguish manner 6) Roguishly 7) With cunning Found on https://www.crosswordclues.com/clue/archly
Arch'ly adverb In an arch manner; with attractive slyness or roguishness; slyly; waggishly. « Archly the maiden smiled. Longfellow. » Found on http://www.encyclo.co.uk/webster/A/116