placid
[adjective]
Synonyms: calm, collected, composed, equable, even-tempered, imperturbable, serene, tranquil, unexcitable, unruffled, untroubled

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Antonyms: roiled, choleric
Contrasted words: fidgety, jittery, jumpy, skittery, agitated
Related Words: irenic, peaceful, serene, unagitated, unstirring, detached, inexcitable, unmoved

[TahlilGaran] English Synonym Dictionary ▲

plac‧id /ˈplæsəd, ˈplæsɪd/ adjective
[Date: 1600-1700; Language: Latin; Origin: placidus, from placere; ⇒ please²]

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]

[TahlilGaran] Dictionary of Contemporary English ▲