playfulness

(noun) a festive merry feeling. Synonyms: gaiety.

(noun) a disposition to find (or make) causes for amusement. Synonyms: fun. Examples: "Her playfulness surprised me." "He was fun to be with."

(noun) activities that are enjoyable or amusing. Synonyms: fun, merriment. Examples: "I do it for the fun of it." "He is fun to have around."