SOLEMN, SOLEMNITY, SOLEMNLY
ADJECTIVES
1000 — DEEP solemn, grave → obs.
1583 — SULLEN solemn, serious → obs.
1656 — VULTUOSOUS of a grave and solemn countenance; of a heavy and sad look → obs.
1785 — FIDDLE-FACED long-faced, solemn, melancholy or unhappy looking
1808 — SAIRIE — SAIRY — SARRIE serious, solemn → Sc. obs.
1855 — SOLEMNCHOLY excessively solemn or serious; melancholy
1860 — DUN characterized by solemn reflection; serious, gloomy → obs.
1895 — DEEDY serious, solemn → chiefly Eng. dial.
ADVERBS
1300 — DEEPLY with deep seriousness, solemnly → obs.
1480 — SOLENNY solemnly → obs.
NOUNS
1475 — POMPOSITY pomp, solemnity → obs.
1756 — SUNDAY FACE a sanctimonious expression; an affectedly solemn face → chiefly Sc.
NOUNS – PERSON
..L19 — MOURNING COACH HORSE ‘a tall, solemn woman, dressed in black and many inky feathers’ → UK middle class usage
VERBS
..19C — PULL A LONG FACE to look solemn or dejected → colloq.
Lexicophilia 