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. adjective
    (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
    (of weather) free from storm or wind
  2. adjective
    not easily irritated
    “not everyone shared his placid temperament”
    “remained placid despite the repeated delays”
    synonyms: equable, even-tempered, good-tempered
    having an easygoing and cheerful disposition
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