solemn

Synonyms: austere brooding cold sober deliberate dignified downbeat earnest funereal glum grave heavy intense matter of life and death moody no fooling no-nonsense pensive portentous reflective sedate sober somber staid stern thoughtful weighty

Antonyms: frivolous funny laughing light

Synonyms: august awe-inspiring ceremonial ceremonious conventional devotional dignified divine formal full grand grave hallowed holy imposing magnificent majestic momentous ostentatious overwhelming plenary religious reverential ritual sanctified stately venerable

Antonyms: insignificant ordinary unimpressive unsacred usual