knavish

Like a knave; suited to a knave; tricky; dishonest; fraudulent.

Roguish; waggish; mischievous.

Synonyms Trickish, rascally, unprincipled.

Like or characteristic of a knave{3}; given to knavery; trickish; fraudulent; dishonest; villainous.

Mischievous; roguish; waggish; rascally.