ad. 狡猾地, 秘密地, 俏皮地, 偷偷地

[ adv ]
in an artful manner
<adv.all>
he craftily arranged to be there when the decision was announcedhad ever circumstances conspired so cunningly?

Slyly \Sly"ly\, adv.
In a sly manner; shrewdly; craftily.

Honestly and slyly he it spent. --Chaucer.