silliness
n.the quality of being silly or acting in a way that is not serious. It describes behavior that is playful, foolish, or lacks common sense.
n.the quality or state of being silly; behavior or speech that is foolish, absurd, or lacking in seriousness. Often used to describe a playful or lighthearted mood.
“The children's silliness kept everyone laughing all afternoon.”
“After a long week of serious meetings, the team enjoyed a bit of silliness during the Friday afternoon game.”
“While some critics dismissed the film's silliness as a failure of taste, others argued that the exaggerated humor was precisely what made the story so accessible to a younger audience.”
“The goal for the performances is sincerity rather than silliness.”
From silly + -ness.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.