IPA: /ˈpʌkɪʃli/
KK: /ˈpʌkɪʃli/
In a playful and mischievous manner, often with a sense of humor or trickery.
He smiled puckishly, knowing he had a clever prank planned for his friends.
Puckishly → It is derived from 'puck' (from Middle English *puc*, meaning a mischievous spirit or goblin) and the suffix '-ishly' (meaning in a manner of). The word 'puckishly' describes behavior that is playful and mischievous, akin to that of a goblin.
Think of a 'mischievous spirit' ('puck') acting 'in a playful manner' ('-ishly') — that's why puckishly means behaving in a playful and mischievous way.