plac·id 
/ˈplæsəd/ adjective
/ˈplæsəd/ adjective [more placid; most placid] 1 : not easily upset or excited
▪ a person with a sunny, placid disposition 2 : not moving much : calm and steady
▪ the placid surface of the lake
▪ a person with a sunny, placid disposition
▪ the placid surface of the lake
— pla·cid·i·ty /pləˈsɪdəti/ noun [noncount]
▪ the placidity of the quiet morning
/pləˈsɪdəti/ noun [noncount] ▪ the placidity of the quiet morning
— plac·id·ly adverb
