From Longman Dictionary of Contemporary Englishpuckishpuck‧ish /ˈpʌkɪʃ/ adjective [usually before noun] literary JOKEshowing that you are amused by other people, and like to make jokes about them a puckish grin —puckishly adverb
Examples from the Corpus
puckish• But the smile is puckish indeed, and breaks through the formality of the posture often.• But I have puckish news for you.• Basil Rocke had a very puckish sense of humour and wryness which veiled a deep kindliness.• For all his genius, Fermi had a decidedly puckish side.Origin puckish (1800-1900) Puck evil spirit in old English stories 