"playfulness" in the noun sense
1. gaiety, playfulness
a festive merry feeling
2. playfulness, fun
a disposition to find (or make) causes for amusement
"her playfulness surprised me"
"he was fun to be with"
3. fun, merriment, playfulness
activities that are enjoyable or amusing
"I do it for the fun of it"
"he is fun to have around"
Source: WordNet® (An amazing lexical database of English)
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