名詞 levity:

1. feeling an inappropriate lack of seriousness
2. a manner lacking seriousness

lev.i.ty

n.（名詞）
【復數(shù)】 lev.i.ties
Lightness of manner or speech, especially when inappropriate; frivolity.
輕浮，輕率：舉止或言談不嚴肅，尤指在不適當?shù)膱龊?；輕佻
Inconstancy; changeableness.
易變，多變：不穩(wěn)定；可變
The state or quality of being light; buoyancy.
輕：重量輕的狀態(tài)或性質(zhì)；浮力

來源：
Latin levit3s
拉丁語 levit3s
from levis [light] * see leg wh-
源自 levis [輕的] *參見 leg wh-