(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"
not easily irritated
"an equable temper"
"not everyone shared his placid temperament"
"remained placid despite the repeated delays"
calm and quiet; peaceful; tranquil
"The placid lake reflected the moon so clearly that it looked as though someone had poured silver into the water."