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English definition of “seriousness”

seriousness

noun [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 notion 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 (= completely seriously) now - joking aside - I do think there's a problem here that we've got to get sorted.
(Definition of seriousness from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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