Adjective placid has 4 senses
  1. placid, quiet, still, tranquil, unruffled - free from disturbance; "a ribbon of sand between the angry sea and the placid bay"; "the quiet waters of a lagoon"; "a lake of tranquil blue water reflecting a tranquil blue sky"; "a smooth channel crossing"; "scarcely a ripple on the still water"; "unruffled water"
    Antonym: stormy (indirect, via calm)
  2. equable, even-tempered, good-tempered, placid - not easily irritated; "an equable temper"; "not everyone shared his placid temperament"; "remained placid despite the repeated delays"
    Antonym: ill-natured (indirect, via good-natured)
  3. placid, quiet - without untoward incident or disruption; "a placid existence"; "quiet times"
    Antonym: eventful (indirect, via uneventful)
  4. easygoing, placid - taking life easy; "an easygoing man rarely stirred to anger"; "an air of placid sufficiency"
    Antonyms: discontented, discontent (indirect, via contented)
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