tranquil

1 free from disturbing noise or uproar the house was once again tranquil after the kids moved outside to play Synonyms arcadian, calm, hushed, peaceful, placid, restful, serene, still, stilly, quietRelated Words noiseless, silent, soundless; mute, speechless, wordless; dead, motionless, quiescent; muffled, muted, quieted; dull, gentle, low, soft; ultraquietNear Antonyms crazy, tempestuous, wild; blaring, blasting, booming, earsplitting, piercing, roaring, thundering, thunderousAntonyms boisterous, clamorous, clattery, deafening, loud, noisy, raucous, rip-roaring, roistering, romping, rowdy, tumultuous, unquiet, uproarious, woolly (also wooly)

2 free from emotional or mental agitation though she should have been upset, she felt oddly tranquil upon learning that she would not be receiving the scholarship Synonyms collected, composed, cool, coolheaded, equal, level, limpid, peaceful, placid, possessed, recollected, sedate, self-composed, self-possessed, serene, smooth, together, calm, undisturbed, unperturbed, unruffled, unshaken, untroubled, unworriedRelated Words even, even-keeled, steady, well-adjusted, well-balanced; imperturbable, nerveless, unflappable, unshakable; centered, disciplined, equable, self-contained, self-controlled; affable, breezy, devil-may-care, easygoing, happy-go-lucky, laid-back, loosey-goosey, mellow; carefree, nonchalant, unconcerned; assured, confident, self-assured; aloof, detached, dispassionate, indifferent; bovine, impassive, phlegmatic, sober, stolid; relaxed, relieved, tranquilized (also tranquillized)Near Antonyms anxious, bothered, distressed, uneasy, unquiet, unsettled, worried; jittery, jumpy, nervous, restless, skittish, tense; high-strung, unstable, uptightAntonyms agitated, discomposed, disturbed, flustered, perturbed, unglued, unhinged, unstrung, upset

3 free from storms or physical disturbance drifting dreamily through tranquil seas Synonyms halcyon, hushed, lown [dialect], peaceful, placid, quiet, serene, still, stilly, calm, untroubledRelated Words balmy, clement, equable, gentle, mild, moderate, temperate; clear, cloudless, fair, rainless, sunny, sunshiny, windlessNear Antonyms blizzardy (also blizzardly), blustery, squally, windy; extreme, foul, intemperate, nasty, severeAntonyms agitated, angry, inclement, restless, rough, stormy, tempestuous, turbulent, unquiet, unsettled