the state or quality of being serene, calm, or tranquil; sereneness.

( usually initial capital letter ) a title of honor, respect, or reverence, used in speaking of or to certain members of royalty (usually prec. by his, your, etc.).

noun

agitation , disruption , disturbance , excitement , trouble

noun

calmness , composure , cool , patience , peace , peace of mind , placidity , quietness , quietude , stillness , tranquillity , peacefulness , placidness , calm , hush , lull , quiet , untroubledness , balance , clearness , cloudlessness , tranquility