Longman Dictionary of Contemporary English homepage

seriousness

noun
     
se‧ri‧ous‧ness [uncountable]
1 the quality of being serious
2

in all seriousness

a) spoken used to show that what you say next is not a joke, especially because it is important [= seriously]:
In all seriousness, if Tom does resign, a lot of other people will start leaving too.
b) in a way that is not joking:
'Playing with Richie was the highlight of my musical career,' said Sonny in all seriousness.

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