elfishly

/ˈɛlfɪʃli/
adverb
  1. In a way that is playful, mischievous, or suggestive of an elf.
    • He winked elfishly at his friend as they planned the surprise.
    • She grinned elfishly before hiding behind the curtain.
    • The cat moved elfishly, sneaking up on the toy mouse.
Antonyms