adjective
quiet, serious
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
adjective
impressive, sacred
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