'Slyly' definitions:

Definition of 'slyly'

(from WordNet)
adverb
In an artful manner; "he craftily arranged to be there when the decision was announced"; "had ever circumstances conspired so cunningly?" [syn: craftily, cunningly, foxily, knavishly, slyly, trickily, artfully]

Definition of 'Slyly'

From: GCIDE
  • Slyly \Sly"ly\, adv. In a sly manner; shrewdly; craftily. [1913 Webster]
  • Honestly and slyly he it spent. --Chaucer. [1913 Webster]