plac·id
/ˈplasəd/Submit
adjective
adjective: placid
(of a person or animal) not easily upset or excited.
"this horse has a placid nature"
synonyms: even-tempered, calm, tranquil, equable, unexcitable, serene, mild, 'calm, cool, and collected', composed, self-possessed, poised, easygoing, levelheaded, steady, unruffled, unperturbed, phlegmatic; informalunflappable
"she's normally very placid"
antonyms: excitable
(especially of a place or stretch of water) calm and peaceful, with little movement or activity.
"the placid waters of a small lake"
synonyms: quiet, calm, tranquil, still, peaceful, undisturbed, restful, sleepy
"a placid village"
antonyms: bustling