the.com/frivolity

means Lighthearted, trivial behavior or an activity that has no serious purpose beyond fun.

from From Latin frivolus, meaning worthless or silly — a word some scholars link to friare, 'to crumble or rub away,' as if frivolous things were too flimsy to hold any real weight. It passed through French into English around the 17th–18th century, keeping its sense of something delightfully insubstantial.