1 earnestness, grandeur, gravitas, gravity, impressiveness, momentousness, portentousness, sacredness, sanctity, seriousness
2 (often plural)
celebration, ceremonial, ceremony, formalities, observance, proceedings, rite, ritual
English Collins Dictionary - English synonyms & Thesaurus
1 adj Someone or something that is solemn is very serious rather than cheerful or humorous.
His solemn little face broke into smiles..., He looked solemn.
The setting for this morning's signing ceremony matched the solemnity of the occasion.
2 adj A solemn promise or agreement is one that you make in a very formal, sincere way.
...a solemn pledge that he would never remarry.
Translation English Cobuild Collins Dictionary
Add your entry in the Collaborative Dictionary.