earnest
used in The Call of the Wild

only 1 use

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Definition

characterized by sincere belief

or:

intensely or excessively serious

Pike, the malingerer, who, in his lifetime of deceit, had often successfully feigned a hurt leg, was now limping in earnest.
Chapter 5 — The Toil of Trace and Trail (2% in)

There are no more uses of "earnest" in The Call of the Wild.

Typical Usage (best examples)