The Collaborative International Dictionary
Solemnness
Solemnness \Sol"emn*ness\, n. The state or quality of being solemn; solemnity; impressiveness; gravity; as, the solemnness of public worship. [Written also solemness.]
Wiktionary
solemnness
n. The state or quality of being solemn.
Usage examples of "solemnness".
She gazed up with a solemnness he'd never seen in her features before.
Outwardly, the chief resembled Kami, but there was a solemnness to his aspect that was absent in the younger Garudan.