serenity
/sɪˈrenətɪ/noun
(pl. -ies)［mass noun］
- the state of being calm, peaceful, and untroubled平静, 宁静：
an oasis of serenity amidst the bustling city.
繁忙城市中的宁静绿洲。
词源
late Middle English: from Old French serenite, from Latin serenitas, from serenus 'clear, fair' （see SERENE）.