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se‧ri‧ous‧ness
[uncountable]
[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.
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.
'Playing with Richie was the highlight of my musical career,' said Sonny in all seriousness.
