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Adjective: placid  pla-sid
  1. (of a body of water) free from disturbance by heavy waves
    "a ribbon of sand between the angry sea and the placid bay";
    - quiet, still, tranquil, smooth, unruffled
  2. Not easily irritated
    "not everyone shared his placid temperament"; "remained placid despite the repeated delays";
    - equable, even-tempered, good-tempered

See also: calm, good-natured

Encyclopedia: Placid, Texas