You know yourself how earnestly in the last months of last year, I laboured to relieve suffering; you know that much was done for others, and that the days passed quietly, almost happily for myself.
Though so profound a double-dealer, I was in no sense a hypocrite; both sides of me were in dead earnest; I was no more myself when I laid aside restraint and plunged in shame, than when I laboured, in the eye of day, at the furtherance of knowledge or the relief of sorrow and suffering.
There are no more uses of "earnest" in the book.
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Both sides were deeply in earnest, even passionate.
She has a casual, go-with-the-flow personality and doesn’t appreciate his earnestness.