devilish

You can describe someone as devilish if they're nasty and cruel, although this adjective is also used for rascally or naughty people, like the devilish kids you babysit.

A devilish punishment is cruel, but a devilish preschooler simply misbehaves in a playful way. Since about 1600, the word devil has been used to mean not just an "evil, diabolical spirit," but also a "clever rogue." The adjective has followed suit, so you might describe a terrifying movie monster as a devilish creature, while also calling your favorite rascal a devilish creature.

Definitions of devilish
1

adj showing the cunning or ingenuity or wickedness typical of a devil

devilish schemes”
Synonyms:
diabolic, diabolical, mephistophelean, mephistophelian
evil
morally bad or wrong

adj playful in an appealingly bold way

Synonyms:
rascally, roguish
playful
full of fun and high spirits

adv in a playfully devilish manner

Synonyms:
devilishly

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