seriousness Meaning in the Cambridge English Dictionary
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Meaning of “seriousness” in the English Dictionary

"seriousness" in British English

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seriousnessnoun [U]

uk   /ˈsɪə.ri.əs.nəs/  us   /ˈsɪr.i-/

seriousness noun [U] (BAD)

the ​state of being very ​bad or ​severe: I don't ​think he has any ​idea of the seriousness of the ​situation.

seriousness noun [U] (NOT JOKING)

the ​state of being ​serious, ​rather than ​intending to be ​funny: In all seriousness now (= I am now being ​serious and no ​longerjoking), I do ​think there's a ​problem here that we need to ​straighten out.
(Definition of seriousness from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"seriousness" in American English

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seriousnessnoun [U]

 us   /ˈsɪr·i·əs·nəs/
the ​quality or ​state of being ​serious or ​severe in ​effect : I don’t ​think he has any ​idea of the seriousness of the ​situation.
(Definition of seriousness from the Cambridge Academic Content Dictionary © Cambridge University Press)
Translations of “seriousness”
in Arabic جٍدّية…
in Korean 심각함, 진지함…
in Portuguese seriedade…
in Catalan gravetat, serietat…
in Japanese 深刻さ, 真剣さ, まじめさ…
in Chinese (Simplified) 坏的, 严重, 恶劣…
in Chinese (Traditional) 壞的, 嚴重, 惡劣…
in Italian gravità, serietà…
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