Call a body of water placid if it has a smooth surface and no waves. Call a person placid if they don't tend to make waves by causing a fuss.

Coming from the Latin placidus "pleasing or gentle," placid is most commonly used to describe a person who is not easily irritated or a body of water such as a lake that does not have waves to disturb the surface. Synonyms of placid in both meanings include calm, serene and tranquil. In other uses, placid describes something with little disruption — like "a placid neighborhood."

Definitions of placid

adj (of a body of water) free from disturbance by heavy waves

“a ribbon of sand between the angry sea and the placid bay”
quiet, smooth, still, tranquil, unruffled
(of weather) free from storm or wind

adj not easily irritated

“not everyone shared his placid temperament”
“remained placid despite the repeated delays”
equable, even-tempered, good-tempered
having an easygoing and cheerful disposition

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