tranquillity
noun [ U ] (US usually tranquility) uk/træŋˈkwɪl.ə.ti/ us/træŋˈkwɪl.ə.t̬i/
C2 平静，宁静祥和
a peaceful, calm state, without noise, violence, worry, etc.
living in peace and tranquillity 生活在平静祥和之中
I love the tranquillity of the countryside. 我喜欢乡村的恬静。
Synonyms: peace (CALM)peacefulness (CALMNESS)quietude