seriousness

严重性、严重程度

Few people understood the seriousness of the water shortage at first.

起初很少有人了解缺水问题的严重性。

严肃、认真

She spoke about the plan with a seriousness that surprised everyone.

她谈起这个计划时的认真态度让大家都很意外。

说真的、老实说口语

In all seriousness, you should see a doctor about that cough.

说真的，你那个咳嗽应该去看医生。