All 6 Uses

somber
in
The Thundering Herd
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Pruitt pondered this suggestion for a moment and then somberly shook his head.
Chpt 14

somberly = solemnly (in a manner that is serious--not cheerful or lighthearted)
His working, fiercely malignant visage as suddenly set somberly.
Chpt 16 *
Tom Doan, riding with these silent, somber men, felt a strong beat of his pulse that was at variance with the oppression of his mind.†
Chpt 11
This hard-faced, apparently dull and somber man might befriend her.†
Chpt 13
She was the mainspring of Jett's calculated mechanism, and when the other men realized it, it precipitated something darkly somber into the situation.†
Chpt 14
She felt the grim and somber presence of death; she felt the imminence of further developments, sinister, harrowing, revolving more around her.†
Chpt 14

Definitions:

(1) (somber as in: a somber mood)
serious (without cheer or lightheartedness); or sad
(2) (somber as in: somber colors)
lacking brightness or color -- perhaps gloomy
(3) (meaning too rare to warrant focus)