in all seriousness
In one's sincere opinion; without any disingenuousness. In all seriousness, I think this project plan is severely flawed. In all seriousness, even though I majored in English literature, I've never read anything by Hemingway! A: "Sorry for canceling on you like that." B: "That's OK. In all seriousness, I would rather just stay home and watch a movie tonight anyway."
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