Serenity \Se*ren"i*ty\, n. [L. serenuas: cf. F. s['e]r['e]nit['e].]
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.