placid   (Sound)

The placid has 2 Senses.

• smooth, unruffled, tranquil, quiet, still, placid
• 静か, 静やか, 閑やか, 穏やか, 静穏, 閑か
• (of a body of water) free from disturbance by heavy waves; "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"
• （水域について）激しい波による騒乱がない

• good-tempered, equable, even-tempered, placid
• 大人しやか, 温和しやか, 浩然たる
• not easily irritated; "an equable temper"; "not everyone shared his placid temperament"; "remained placid despite the repeated delays"
• 簡単に苛立たない