The Collaborative International Dictionary of English v.0.48:

Puckish \Puck"ish\, a. [From Puck.]
   Resembling Puck; merry; mischievous. "Puckish freaks." --J.
   R. Green.
   [1913 Webster]

WordNet (r) 3.0 (2006):

puckish
    adj 1: naughtily or annoyingly playful; "teasing and worrying
           with impish laughter"; "a wicked prank" [syn: arch,
           impish, implike, mischievous, pixilated,
           prankish, puckish, wicked]

Moby Thesaurus II by Grady Ward, 1.0:

25 Moby Thesaurus words for "puckish":
   antic, arch, devilish, elfish, elvish, foolish, full of mischief,
   high-spirited, impish, knavish, larkish, mischief-loving,
   mischievous, playful, prankish, pranksome, pranky, roguish,
   scampish, scapegrace, sportive, trickish, tricksy, waggish,
   wicked