1. (adv.) In a knavish manner; dishonestly; fraudulently.

2. (adv.) Mischievously; waggishly; roguishly.

as a joke devilishly elfishly for amusement for fun for kicks for laughs for sport impishly in jest in joke in play in sport jestingly jokingly knavishly mischievously playfully prankishly puckishly roguishly scampishly sportively waggishly