in all seriousness


in all seriousness

In one's sincere opinion; without any disingenuousness. In all seriousness, I think this project plan is severely flawed.See also: all

in all ˈseriousness

seriously; not jokingly: Surely you’re not telling me, in all seriousness, that you want to work in a factory for the rest of your life! OPPOSITE: (with) tongue in cheekSee also: all