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seriousness

/ˈsɪɹiəsnəs/ noun B2
  1. The state or quality of being serious. (countable, uncountable)

Plural seriousnesses

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From the library

I laughed at the quaint message; but Holmes showed unwonted seriousness.
The Valley of Fear, p. 100 · C1
I tell you, Watson, in all seriousness, that if I could beat that man, if I could free society of him, I should feel that my own career had reached its summit, and I should be prepared to turn to some more placid line in life.
The Memoirs of Sherlock Holmes, p. 104 · B2

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.