frivolousness 

英汉解释

n. 愚笨

同义词

n. frivolity

反义词

n.   earnestness，serious-mindedness，seriousness，sincerity

参考例句

1. Lack of importance or purpose; frivolousness.
无意义或无目的；
2. Inclined to wisdom but not to learning, frivolousness would be the failure.
喜欢知识，却不喜欢学习，其弊乃放荡不羁；
3. All this frivolousness could not come at a better time, smack in the middle of our it's-not-really-that-bad recession.
这种种琐碎无聊来得实在是再恰当不过了-正好大家觉得经济衰退还不很糟的时候，它豁然出现。

英英解释

n.
  1. the trait of being frivolous; not serious or sensible

网络释义

frivolousness
轻薄; 愚笨; 无关紧要; 轻率;