#graveness__gravenes__sobriety__soberness__somberness  a manner that is serious and solemn
  supertype:  serious-mindedness__seriousness__earnestness__sincerity  the trait of being serious; "a lack of solemnity is not necessarily a lack of seriousness"- Robert Rice
  subtype:  stodginess__stuffiness  dull and pompous gravity

No statement uses or specializes graveness; click here to add one.