Synonyms for solemn

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1. Appearing serious or thoughtful

   grave, serious, sober, portentous, earnest, intense, deliberate, heavy, austere, somber, dignified, staid, sedate, no-nonsense, awe-inspiring, pensive, brooding, moody, grim, stern, thoughtful, reflective.

   Antonyms happy*, gay, lighthearted.

2. Impressive

   imposing, ceremonious, overwhelming; see grand 2.

3. Sacred

   religious, holy, hallowed; see divine 2. See syn. study at serious.