American English

Definition of seriousness noun from the Oxford Advanced American Dictionary

 

seriousness

 noun
noun
NAmE//ˈsɪriəsnəs//
 
[uncountable, singular]
 
jump to other results
  • 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
     
    jump to other results
    very seriously; not as a joke He told us in all seriousness that he was going to join a circus.
    See the Oxford Advanced Learner's Dictionary entry: seriousness