knavish

Adjective

Synonyms: crafty cunning dodgy foxy guileful slick sly tricksy tricky wily

WordNet 3.0

Adjective (1)

marked by skill in deception“cunning men often pass for wise”“deep political machinations”“a foxy scheme”“a slick evasive answer”“sly as a fox”“tricky Dick”“a wily old attorney”Synonyms: crafty cunning dodgy foxy guileful slick sly tricksy tricky wily

Webster's Dictionary (GCIDE)

Knavish \Knav"ish\, a.

1.Like or characteristic of a knave[3]; given to knavery; trickish; fraudulent; dishonest; villainous; as, a knavish fellow, or a knavish trick. "Knavish politicians." --Macaulay. [1913 Webster]

2.Mischievous; roguish; waggish; rascally. [1913 Webster]

Cupid is knavish lad, Thus to make poor females mad.— Shak.[1913 Webster]