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Definition of seriousness noun from the Oxford Advanced American Dictionary

 

seriousness

 noun
noun
NAmE//ˈsɪriəsnəs//
 
[uncountable, singular]
 
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  • the state of being serious He spoke with a seriousness that was unusual in him. We saw from the seriousness of her expression that she meant it.
    • Idioms
    in all seriousness
     
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    very seriously; not as a joke He told us in all seriousness that he was going to join a circus.
    See seriousness in the Oxford Advanced Learner's Dictionary
    Check pronunciation: seriousness

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