i Register
In some senses, solemn is marked as obsolete. Watch for register when choosing this word.
adj
Of or pertaining to religious ceremonies and rites; (generally) religious in nature; sacred.
Characterized by or performed with appropriate or great ceremony or formality.
Whereas the accentuated linearism, the angular stylization of the folds, the rhythmical course of the outlining and the solemn frontality conjoined with an air of regality in the pose seem to recall the formal repertory of the Corbolinus Master and his group […]
Deeply serious and sombre; grave.
Inspiring serious feelings or thoughts; sombrely impressive.
Cheerless, gloomy, sombre.