All 7 Uses

earnest
in
Twilight, by Stephenie Meyer
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I stared at him earnestly, hoping to disguise my impatience as admiration.†
Chpt 6 *

earnestly = sincerely or seriously
"And thanks," I added earnestly.†
Chpt 6
He laughed in earnest now, understanding.†
Chpt 14

in earnest = serious; or in a serious manner
Then he took my face in his hands almost roughly, and kissed me in earnest, his unyielding lips moving against mine.†
Chpt 17
Her voice was earnest.†
Chpt 20

earnest = sincere or serious
His wide eyes were so earnest and sincere, I almost believed him myself.†
Chpt 24
"Look, Jacob, I know Billy probably won't believe this, but just so you know" — he looked at me now, responding to the new earnestness in my voice — "Edward really did save my life.†
Chpt Epil.

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).