All 5 Uses

solemn
in
The Silver Chair
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"Not half so curious as himself," said Eustace solemnly.†
Chpt 1

solemnly = with seriousness and dignity
His expression was solemn,
Chpt 5 *

solemn = serious and possibly dignified
"Well, children," she said, "you have a wise, solemn old guide with you.†
Chpt 6

solemn = very serious--possibly dignified
They are solemn, majestic people, full of ancient wisdom which they learn from the stars, not easily made either merry or angry; but their anger is terrible as a tidal wave when it comes.†
Chpt 16
Musicians, hidden somewhere in the crowd, began to play solemn, triumphal music.†
Chpt 16

Definitions:

(1) (solemn)
in a very serious (and often dignified) manner
(2) (meaning too rare to warrant focus)
Less commonly, solemn can mean that something was done with great or appropriate ceremony. It can also be used to describe something as dark or undecorated.