Synonyms of the word

solemn

• adj. Deeply serious and somber.
• adj. Somberly impressive.
• adj. Performed with great ceremony.
• adj. Sacred.
• adj. Gloomy or sombre.

earnest

• n. Gravity; serious purpose; earnestness.
• n. Seriousness; reality; actuality (as opposed to joking or pretence).
• v. (transitive) To be serious with; use in earnest.
• adj. Serious in speech or action; eager; urgent; importunate; pressing; instant.
• adj. (with a positive sense) Focused in the pursuit of an objective; eager to obtain or do.
• adj. Intent; fixed closely.
• adj. Possessing or characterised by seriousness; strongly bent; intent.
• adj. Strenuous; diligent.
• adj. Serious; weighty; of a serious, weighty, or important nature; not trifling or feigned; important.
• n. A sum of money paid in advance as a deposit; hence, a pledge, a guarantee, an indication of something…
• v. (archaic) second-person singular simple present form of earn.

grave

• n. An excavation in the earth as a place of burial.
• n. Any place of interment; a tomb; a sepulcher.
• n. death, destruction.
• v. (transitive, obsolete) To dig.
• v. (transitive, obsolete) To carve or cut, as letters or figures, on some hard substance; to engrave.
• v. (transitive, obsolete) To carve out or give shape to, by cutting with a chisel; to sculpture.
• v. (transitive, obsolete) To impress deeply (on the mind); to fix indelibly.
• v. (transitive, obsolete) To entomb; to bury.
• v. (transitive, obsolete, nautical) To clean, as a vessel's bottom, of barnacles, grass, etc., and pay it…
• v. (intransitive, obsolete) To write or delineate on hard substances, by means of incised lines; to practice…
• adj. (obsolete) Influential, important; authoritative.
• adj. Characterised by a dignified sense of seriousness; not cheerful, sombre.
• adj. Low in pitch, tone etc.
• adj. Serious, in a negative sense; important, formidable.
• n. A written accent used in French, Italian, and other languages. è is an e with a grave accent.

sedate

• adj. in a composed and temperate state.
• v. to tranquilize by giving a sedative; to calm; to soothe; to induce sleep.

serious

• adj. Without humor or expression of happiness; grave in manner or disposition; earnest; solemn.
• adj. Important; weighty; not insignificant.
• adj. Really intending what is said; in earnest; not jocular or deceiving.

sincere

• adj. Genuine; meaning what one says or does; heartfelt.
• adj. Meant truly or earnestly.

sober

• adj. not drunk; not intoxicated.
• adj. not given to excessive drinking of alcohol.
• adj. moderate; realistic; serious; not playful; not passionate; cool; self-controlled.
• adj. dull; not bright or colorful.
• adj. subdued; solemn; grave.
• v. (often with up) To make or become sober.
• v. (often with up) To overcome or lose a state of intoxication.