tranquil
CALM often implies a contrast with a foregoing or nearby state of agitation or violence. e.g.the protests ended, and the streets were calm again
e.g.the tranquil beauty of a formal garden
SERENE stresses an unclouded and lofty tranquility. e.g.watched the sunset of a serene summer's evening
PLACID suggests an undisturbed appearance and often implies a degree of complacency. e.g.remained placid despite the criticism
PEACEFUL implies a state of repose in contrast with or following strife or turmoil. e.g.grown peaceful in old age
https://gyazo.com/515b6290d1c3c6fb2cc613acf7b07d70
adjective
｟かたく｠ 〈景色･雰囲気･人生などが〉穏やかな, 静かな, 落ち着きのある; 〈心などが〉落ち着いた, 平静な
e.g. her tranquil gaze
e.g. the sea was tranquil.
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ORIGIN