" frolicsome "

1: given to good-natured joking or teasing;

  * e.g., " ... a frolicsome uncle who was a favorite among his relatives "

•  Synonyms : 

•  antic,

•  coltish,

•  elfish,

•  fay,

•  frisky,

•  larky,

•  playful,

•  rollicking,

•  sportful,

•  sportive

•  Antonyms : 

•  earnest,

•  serious-minded,

•  sober,

•  sobersided

2: joyously unrestrained;

  * e.g., " ... teachers smiling at the frolicsome students leaving school for summer vacation "

•  Synonyms : 

•  bouncy,

•  bubbly,

•  buoyant,

•  crank,

•  effervescent,

•  exuberant,

•  frolic,

•  gamesome,

•  gay,

•  high-spirited,

•  vivacious

•  Antonyms : 

•  low-spirited,

•  sullen