placid

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
1

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

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

adj not easily irritated

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

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