puck·ish 
/ˈpʌkɪʃ/ adjective
/ˈpʌkɪʃ/ adjective [more puckish; most puckish] literary : having or showing a desire to cause trouble in a playful or harmless way : mischievous
▪ He had a puckish smile/look on his face.
▪ He had a puckish smile/look on his face.
