Webster's Revised Unabridged Dictionary · 1913

Knavish

Knavish , adjective

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. — Shakespeare