/ ˈtræŋkwɪl; NAmE / adjective
( formal ) quiet and peaceful
SYN serene :
a tranquil scene
the tranquil waters of the lake
She led a tranquil life in the country.
► tran·quil·lity ( BrE ) ( NAmE also tran·quil·ity ) / træŋˈkwɪləti; NAmE / noun [ U ]
► tran·quil·ly adverb
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WORD ORIGIN
late Middle English: from French tranquille or Latin tranquillus .