solemnness

adjective

1. 1. observed or done according to ritual or tradition: said esp. of religious holidays, rites, etc.
   2. sacred in character
2. according to strict form; formal: a solemn ceremony
3. 1. serious or grave: a solemn face
   2. deeply earnest; very sincere: a solemn oath
4. very impressive or arousing feelings of awe because of its great importance or seriousness: a solemn occasion
5. somber because dark in color