Puckish (adjective) means impish or whimsical; playful - especially in a mischevious way. Taken, of course, from the mythological fairy Robin Goodfellow, an Old English/Celtic "puca." You may remember him from Shakespeare's A Midsummer Night's Dream. Depictions of him have him resembling a faun (Mr. Tumnus) or a satyr with a goat's hooves and long, pointed ears (eyebrows to match). I love this word, because I envision puck sitting in a tree with a wink and a grin to rival Peter Pan's.