larkish

/ˈlɑrkɪʃ/
adjective
  1. Playful, mischievous, or carefree in a lighthearted way.
    • His larkish sense of humor kept the office atmosphere light and friendly.
    • The larkish kitten batted at every dangling string with delight.
    • The movie had a larkish tone, full of silly chases and harmless tricks.
Antonyms
What does "larkish" mean? | whatsthatwordmean | whatsthatwordmean