seriousness
noun [ U ] uk/ˈsɪə.ri.əs.nəs/ us/ˈsɪr.i.əs.nəs/
(BAD)
严重；恶劣
the state of being very bad or severe
I don't think he has any idea of the seriousness of the situation. 我认为他一点儿也不明白形势的严峻性。
Synonyms: gravity (SERIOUS)severity (SERIOUS)
(NOT JOKING)
严肃;认真
the state of being serious, rather than intending to be funny
In all seriousness now (= I am now being serious and no longer joking), I do think there's a problem here that we need to straighten out. 现在说正经的——我确实认为这儿有个问题我们得解决。