If you refer to an activity as a frivolity, you think that it is amusing and rather silly, rather than serious and sensible.
例句
There is a serious message at the core of all this frivolity...在所有這些鬧騰的核心傳遞著一個嚴肅的信息。He was one of my most able pupils, but far too easily distracted by frivolities.他是我最有才華的學生之一，只是太容易被一些無聊的事分心。
英漢詞典釋義
n.
輕松的樂事, 興高采烈
Most people enjoy a few frivolities during their holiday.大多數人都喜歡在假期中享受一些輕松的娛樂。
愚蠢的行為；可笑的表現；輕浮的舉止
I dislike her frivolity.我討厭她輕浮的舉止。
英英詞典釋義
Noun
1. the trait of being frivolous; not serious or sensible