The term 'playfully mischievous' can be summed up with two crossword solutions: 'PUCKISH' (7 letters) and 'ARCH' (4 letters). PUCKISH is an adjective derived from the name of the mischievous sprite in William Shakespeare's play A Midsummer Night's Dream. It is used to describe someone who is mischievous, playful, and impish. The word ARCH is also an adjective that describes someone who is mischievous in a playful way, but with a hint of slyness or cunning.