seriousness

n.

认真；严肃地；严重地；非常严肃地

in all seriousness严肃地；庄重地

1. Humor must have its background of seriousness.
   幽默必须以严肃为背景。
2. I tell you this in all seriousness.
   我是严肃地告诉你这件事的。
3. Jack's countenance assumed an air of seriousness.
   捷克装出认真的表情。
4. His tone contained the right mixture of banter and seriousness.
   他的口气是半戏谑半认真的。

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From Ritual to Theater: The Human Seriousness of Play
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Is there a relation between the seriousness of suicidal intent and the lethality of the suicide attempt?
The role of early aggressive behavior in the frequency, seriousness, and types of later crime.