Placidity

n.

1.

The quality or state of being placid; calmness; serenity.

Noun	1.	placidity - a feeling of calmness; a quiet and undisturbed feeling Synonyms: placidness
	2.	placidity - a disposition free from stress or emotion Synonyms: serenity, tranquility, tranquillity, repose, quiet

calmness, placidness