graveness(n = noun.attribute) gravity, soberness, sobriety, somberness, sombreness - a manner that is serious and solemn;
is a kind of earnestness, serious-mindedness, seriousness, sincerity
has particulars: stodginess, stuffiness
Derived forms adjective grave₃, adjective grave₁

   The quality of being grave. [1913 Webster]
"His sables and his weeds,
Importing health and graveness." [1913 Webster]