playfulness in WordNet English dictionary

1. activities that are enjoyable or amusing
   "I do it for the fun of it"; "he is fun to have around"
   fun  merriment  playfulness 
   
2. a disposition to find (or make) causes for amusement
   "her playfulness surprised me"; "he was fun to be with"
   playfulness  fun 
   
3. a festive merry feeling
   gaiety  playfulness 
   

playfulness in English Wiktionary