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adjective
peaceful, quiet (inanimate)
Synonyms: at a standstill, at peace, bland, bucolic, cool, halcyon, harmonious, hushed, inactive, in order, low-key, mild, motionless, pacific, pastoral, placid, quiescent, reposeful, reposing, restful, rural, serene, slow, smooth, soothing, still, stormless, tranquil, undisturbed, unruffled, waveless, windless
Antonyms: excited, fierce, frenzied, rough, stormy, turbulent, violent, wild
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adjective
composed, cool (animate)
Synonyms: aloof, amiable, amicable, civil, collected, cool as cucumber, cool-headed, detached, disinterested, dispassionate, equable, gentle, impassive, imperturbable, inscrutable, kind, laid-back, levelheaded, listless, moderate, neutral, patient, placid, pleased, poised, relaxed, restful, satisfied, sedate, self-possessed, serene, still, temperate, unconcerned, undisturbed, unemotional, unexcitable, unexcited, unflappable, unimpressed, unmoved, unruffled, untroubled
Antonyms: agitated, angry, excitable, excited, furious, mad, passionate, roused, ruffled, wild, worried
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noun
quietness, composure
Synonyms: calmness, dispassion, doldrums, hush, impassivity, imperturbation, lull, patience, peace, peacefulness, peace of mind, placidity, quiet, repose, rest, restraint, serenity, silence, stillness, stoicism, tranquility
Antonyms: agitation, anger, madness, restlessness, storminess, terror, turbulence, violence
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verb
make composed, quiet
Synonyms: allay, alleviate, appease, assuage, balm, becalm, compose, cool, cool it, cool out, hush, lay back, lull, mitigate, mollify, pacify, placate, quiet, quieten, relax, relieve, sedate, settle, simmer down, soft-pedal, soothe, steady, still, stroke, take it easy, take the edge off, tranquilize
Antonyms: agitate, anger, disquiet, distract, excite, inflame, irritate, outrage, rouse, ruffle, worry