All 8 Uses

solemn
in
The Grapes of Wrath
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He did not hear Joad approaching, for he was whistling solemnly the tune of "Yes, Sir, That's My Baby.†
Chpt 4

solemnly = with seriousness and dignity
Four solemn years I been eatin' right on the minute.†
Chpt 6

solemn = very serious--possibly dignified
And now he made his report solemnly.†
Chpt 10

solemnly = with seriousness and dignity
They turned solemnly and walked to the truck.†
Chpt 13
Casy said solemnly, "This here ol' man jus' lived a life an' just died out of it. ..."
Chpt 13 *

solemnly = very seriously
Ruthie said solemnly, "Grampa's down under there.†
Chpt 13

solemnly = with seriousness and dignity
Winfield nodded solemnly.†
Chpt 18
Her eyes remained on Winfield's tow head; and as she looked, the little boy opened his eyes and stared out at her, and his eyes were solemn.†
Chpt 22

solemn = very serious--possibly dignified

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.