Solemn

1. Marked with religious rites and pomps; enjoined by, or connected with, religion; sacred.
2. Fitted to awaken or express serious reflections; marked by seriousness; serious; grave; devout; as, a solemn promise; solemn earnestness.
3. Affectedly grave or serious; as, to put on a solemn face.
4. Real; earnest; downright.
5. Made in form; ceremonious; as, solemn war; conforming with all legal requirements; as, probate in solemn form.
6. Pertaining to a festival; festive; festal.
7. Stately; ceremonious; grand.