a. not serious in content or attitude or behavior
a. 轻佻的, 妄动的, 琐碎的
[法] 轻薄的, 轻浮的, 无意义的
1. She made a frivolous purchase that she later regretted.
她做了一个无谓的购买，后来感到后悔。
2. His frivolous attitude towards serious matters can be frustrating.
他对严肃问题的轻浮态度让人感到沮丧。
3. They spent the afternoon engaging in frivolous activities like playing games.
他们花了一下午时间从事一些轻松的活动，比如玩游戏。