levity

n. 轻率, 轻浮, 不稳定

名词复数:levities 

lev.i.ty

n.（名词）
【复数】 lev.i.ties
Lightness of manner or speech, especially when inappropriate; frivolity.
轻浮，轻率：举止或言谈不严肃，尤指在不适当的场合；轻佻
Inconstancy; changeableness.
易变，多变：不稳定；可变
The state or quality of being light; buoyancy.
轻：重量轻的状态或性质；浮力

来源：
Latin levit3s
拉丁语 levit3s
from levis [light] * see leg wh-
源自 levis [轻的] *参见 leg wh-