knavish

Describing Sandy, Jefferson noted, “He is greatly addicted to drink, and when drunk is insolent and disorderly, in his conversation he swears much, and in his behavior is artful and knavish.”

Jess is direct but guarded when it comes to her life, and John is pretentious and calculating, though he gets Jess to open up with his knavish charm.

At one point Mobius freezes the footage to analyze Loki's knavish grin so he can see what everybody else sees, which is someone who delights in others' agony.

Teacher of strange ways is Love, that knavish boy, maker of mischief.

Which shrewd and knavish sprites devised the Faerie Kebabs, each one a toothpick jammed into an olive, a mushroom and a dried apricot?