Etymology
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placid (adj.)

"gentle, quiet, undisturbed, serene, calm," 1620s, from French placide (15c.) and directly from Latin placidus "pleasing, peaceful, quiet, gentle, still, calm," from placere "to please" (see please). Related: Placidly; placidness.

updated on June 30, 2020

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Definitions of placid from WordNet

placid (adj.)
(of a body of water) free from disturbance by heavy waves;
a ribbon of sand between the angry sea and the placid bay
Synonyms: quiet / still / tranquil / smooth / unruffled
From wordnet.princeton.edu, not affiliated with etymonline.