Solemn describes a state or occasion characterized by deep sincerity, seriousness, and gravity. It often involves a formal or dignified atmosphere and reflects a sense of importance, often relating to rituals, commitments, or events of significance, frequently imbued with a feeling of reverence or respect.
A Solemn person or event is marked by a lack of humor or levity and commands respect and attention.
GLUM OATH
SOBER STAID GRAVE HEAVY
SEDATE SOMBRE
SERIOUS EARNEST SINCERE
FUNEREAL
UNSMILING MIRTHLESS
REVERENTIAL