plac ‧ id /ˈplæsəd, ˈplæsɪd/ BrE AmE adjective
[ Date: 1600-1700 ; Language: Latin ; Origin: placidus , from placere ; ⇨ ↑ please 2 ]
1 . a placid person does not often get angry or upset and does not usually mind doing what other people want them to:
a large, placid baby
She sat still, placid and waiting.
2 . calm and peaceful:
The lake was placid and still under the moonlight.
—placidly adverb :
Dobbs stood at the entrance, placidly smoking his pipe.
—placidity /pləˈsɪdəti, pləˈsɪdɪti/ noun [uncountable]