a. 无赖的, 欺诈的, 不正直的

[ adj ]
marked by skill in deception
<adj.all>
cunning men often pass for wisedeep political machinations
a foxy scheme
a slick evasive answer
sly as a fox
tricky Dick
a wily old attorney

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.

2. Mischievous; roguish; waggish; rascally.

Cupid is knavish lad,
Thus to make poor females mad. --Shak.