levity

1. (obsolete) A lack of steadiness.obsoleteuncountableusually

2. (countable) A lighthearted or frivolous act.Examples: "For though it be something wonderful to tell that any should have hearts so hardened, in the midst of such a calamity, as to rob and steal, yet certain it is that all sorts of villainies, and even levities and debaucheries, were then practiced in the town as openly as ever: I will not say quite as frequently, because the number of people were many ways lessened."; "[…] or do the people joy less than common in their levities?""; "His incorrigible levities had probably lost him the countenance of most of his more serious acquaintances[…"countableusually