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English definition of “seriousness”

seriousness

noun [U] (NOT JOKING)    /ˈsɪə.ri.əs.nəs/ US  /ˈsɪr.i-/
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.Lacking humour
(Definition of seriousness noun (NOT JOKING) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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