serenity

serenity is a   Noun

Definition:

[1] The quality or state of being serene; clearness and calmness; quietness; stillness; peace. A general peace and serenity newly succeeded a general trouble. Sir W. Temple.

[2] Calmness of mind; eveness of temper; undisturbed state; coolness; composure. I can not see how any men should ever transgress those moral rules with confidence and serenity. Locke.

Synonyms: