I’m sure we all know someone like this.

puckish (puck·ish): / PUHK ish /
adjective

(1) impish; whimsical; mischievous or naughty in a playful way

[Formed from English ‘puck’ (a.k.a. Robin Goodfellow or hobgoblin) meaning “mischievous spirit.”]

Usage: When asked why she missed the board meeting, she responded by offering a puckish grin and wink.