All 5 Uses

earnest
in
A Thousand Splendid Suns
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"People who've been injured because of war," Giti said earnestly, oblivious to Hasina's toying.†
p. 115.7 *

earnestly = sincerely or seriously
She would miss Giti and her pinch-faced earnestness, yes, and Hasina too, with her wicked laugh and reckless clowning around But, mostly, Laila remembered all too well the inescapable drudgery of those four weeks without Tariq when he had gone to Ghazni.†
p. 152.8

earnestness = sincerity or seriousness
His look was one of conviction, of guileless yet ironclad earnestness.†
p. 183.9
"Yes, please," the girl said earnestly, almost eagerly.†
p. 225.4

earnestly = sincerely or seriously
The man who came to give the news, he was so earnest...I believed him, Tariq.†
p. 340.9

earnest = sincere or serious

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).