/ ˈplæsɪd; NAmE / adjective
1.
( of a person or an animal ) not easily excited or irritated :
a placid baby / horse
OPP high-spirited
2.
calm and peaceful, with very little movement
SYN tranquil :
the placid waters of the lake
► pla·cid·ity / pləˈsɪdəti; NAmE / noun [ U ]
► pla·cid·ly adverb
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WORD ORIGIN
early 17th cent.: from French placide , from Latin placidus , from placere to please.