serious的副词是：seriously ；

seriously：adv.认真地;严重地;严肃地;(用于句首，表示转为谈正事)说正经的，说实在的;非常;极其。 扩展资料

Seriously though, it could be really dangerous.

不过说实在的，这事说不好真的很危险。

It made a refreshing change to be taken seriously for once.

总算有一次受到认真对待，这变化真是令人耳目一新。

Why can't you ever take anything seriously?

你怎么对什么都不当回事呢？

Nothing will be done because no one in authority takes the matter seriously.

什么也办不了，因为掌权的谁也不认真对待这个问题。

We take threats of this kind very seriously.

我们对这类威胁非常重视。

I wish you'd take me seriously.

我希望你认真对待我的话。