Earnestness n. : The state or quality of being earnest; intentness; anxiety.

Example:
Poll: In all Earnestness, do you believe that the best time of your life has already happened?

Taxonomy
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Defination from the web:
earnestness in the Online Dictionary. Meaning of earnestness. Pronunciation of earnestness. Translations of earnestness. ... The fancy was in itself pretty and poetical; the earnestness which had given expression to it would have had its influence over a man of a far ...