All 5 Uses

earnest
in
The Great Gatsby
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"I want to get one of those dogs," she said earnestly.†
p. 27.4 *

earnestly = sincerely or seriously
I was immediately struck by the number of young Englishmen dotted about; all well dressed, all looking a little hungry, and all talking in low, earnest voices to solid and prosperous Americans.†
p. 42.2

earnest = sincere or serious
"— So I took one look at him," said Mr. Wolfshiem, shaking my hand earnestly, "and what do you think I did?"†
p. 69.7

earnestly = sincerely or seriously
Daisy, that's all over now," he said earnestly.†
p. 132.1
He was talking intently across the table at her, and in his earnestness his hand had fallen upon and covered her own.†
p. 145.1

earnestness = sincerity or seriousness

Definitions:

(1) (earnest)
characterized by sincere belief

or:

intensely or excessively serious or determined
(2) (meaning too rare to warrant focus)
Earnest can also be used as a name (variant spelling of Ernest), or to signify the seriousness of a pledge made (as when earnest money is included with an offer to purchase a home).