in all seriousness

idiom

Definition of in all seriousness

: in a serious way used to stress that a statement, question, etc., is not a joke"I was the queen of England in a previous life," she said in all seriousness.In all seriousness, if he does propose, what will you say?

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“In all seriousness.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/in%20all%20seriousness. Accessed 8 Aug. 2020.

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