not serious

基本解释

They have all the weapons in the world but they’re not serious.
他们拥有世界上所有武器，可是他们偏不认真去打。
He was not serious at all. He was always smiling at each of us.
他一点也不严肃，一直对我们每个人微笑。
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When infants begin to engage in rough-and-tumble play, laughter signals that the intentions are not serious, allowing children to test physical and social boundaries without serious jeopardy.
当婴幼儿开始打闹游戏的时候，笑的意图并不严肃，如此孩子们就可以在没有危险的情况下体验身体和社会的边界。

A doctor examined Brown. He reported that Brown's wounds were not serious enough to prevent the trial from starting.
The patriarchal stories are clearly not the work of the Deuteronomist, and these stories must have had very longstanding traditional authority if they were adopted without serious modification by the Deuteronomist redactor some modification, but not serious.
那些宗法故事显然不是预言师的作品，这些故事必然经过了传统权威的检验,如果他们是未经更改直接引用的话,由那些预言编写者,这里有一些改动，但不是太多。
耶鲁公开课 - 旧约导论课程节选
Since they do not think about the things that are serious, they get excited by tiny things."
尽管他们不会考虑国家大事,但零星琐事都却能令他们激动万分
耶鲁公开课 - 1871年后的法国课程节选

With that said, what you wrote are not serious policy suggestion but bumper sticker slogans.
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