The state of being very serious and not cheerful.
Solemnnesses is usually a quiet and thoughtful feeling, like when people are at a sad ceremony or a very important event.
Examples:
The solemnnesses of the funeral made everyone quiet.
At the ceremony, the solemnnesses in the air was heavy.
She felt the solemnnesses of the moment deeply.
The solemnnesses of the meeting made everyone yawn.
The solemnnesses of the library made it feel like a special place.
The solemnnesses of the courtroom made everyone pay attention.