KNAVISHLY

craftily, cunningly, foxily, knavishly, slyly, trickily, artfully

(adverb) in an artful manner; “he craftily arranged to be there when the decision was announced”; “had ever circumstances conspired so cunningly?”

Source: WordNet® 3.1

Etymology

Adverb

knavishly (comparative more knavishly, superlative most knavishly)

In a knavish manner.

Source: Wiktionary

Knav"ish*ly, adv.

1. In a knavish manner; dishonestly; fraudulently. Holland.

2. Mischievously; waggishly; roguishly. "Knavishly witty." Gayton.

KNAVISH

Knav"ish, a.

1. Like or characteristic of a knave; given to knavery; trickish; fraudulent; dishonest; villainous; as, a knavish fellow, or a knavish trick. "Knavish politicians." Macaulay.

2. Mischievous; roguish; waggish. Cupid is knavish lad, Thus to make poor females mad. Shak.

Source: Webster’s Unabridged Dictionary 1913 Edition