Synonyms for Quiet:

adj.

all (adjective)
restrained.
calm (adjective)
placid, easygoing, collected, calm, pacific, cool, unruffled, moderate, mild, tranquil, sedate, still, relaxed, even-tempered, undisturbed, composed, serene, peaceful.
calm, peaceful (adjective)
motionless, halcyon, pacific, serene, mild, gentle, retired, placid, meek, sedate, tranquil, collected, fixed, untroubled, stagnant, level, unruffled, undisturbed, smooth, restful, inactive.
dumb (adjective)
speechless.
humble (adjective)
unpretentious.
inactive (adjective)
somnolent, quiescent.
inert (adjective)
inert.
insensitive (adjective)
dull.
mild (adjective)
benign, gentle, tender, libertarian, insipid, kind, even, amiable, clement, permissive, lax, forbearing, sweet, tolerant, lenient, peaceable, broad-minded, mild, benevolent, genial, meek, peaceful, soft, open-minded, charitable, cordial, liberal, moderate.
moderate (adjective)
innocuous, tranquil, gentle, easy, pacific, moderate, cool, soft, temperate, alleviated, composed, subdued, calm, soothing, relaxed, restrained.
motionless (adjective)
inactive, dormant, becalmed, standing, level, languid, idle, calm, dead, fixed, vegetative, motionless, immobile, stationary, still, inert, static, Resting, stagnant, sleeping, tranquil, unmoving.
resting (adjective)
Resting.
restrained (adjective)
reserved.
silent (adjective)
low, dumb, mute, taciturn, close, close-mouthed, uncommunicative, tight-lipped, noiseless, hushed, mum, Lulled, still, silent, reserved, unexpressed, soundless, speechless, unuttered, inaudible.
simple, unobtrusive (adjective)
unpretentious, subdued, modest, plain, Inobtrusive, tasteful, restrained, sober.
taciturn (adjective)
tight-lipped.
tightlipped (adjective)
close-mouthed.
uncommunicative (adjective)
taciturn.
well-behaved (adjective)
orderly.
without or with little sound (adjective)
muted, hushed, close, soft, unuttered, peaceful, low, unexpressed, dumb, inaudible, taciturn, quiescent, mute, speechless, tight-lipped, noiseless, soundless, uncommunicative, silent, reserved, close-mouthed, still.

adv.

all (adverb)
quietly.

n.

bitter, blind, casual, burning, acutely, basic, deep-seated, affective, depth, deep. low, whispery, small, cozy, somnolent. economical, terse, laconic, brief, succinct, monosyllabic, concise, Inobtrusive, tasteful, plain, unobtrusive. cut out, block out, drown. highlight, slowdown, leisure, hiatus, low gear. light, monotone. quiet as a mouse, you could hear a pin drop. calm (noun)
poise, peacefulness, calmness, composure, stillness, placidity, equanimity, patience.
calmness, silence (noun)
peace, quietness, hush, serenity, stillness, noiselessness, ease, soundlessness, lull, repose, tranquillity, rest, calm, stop.
inactivity (noun)
rest.
leisure (noun)
leisure.
moderation (noun)
composition, temperateness, alleviation, moderation, pacification, restraint, gentleness, softness, calming.
peace (noun)
orderliness, accord, concord, quietness, order, truce, repose, tranquility, friendliness, amity, cease-fire, nonresistance, quiescence, neutrality, peace, rest, nonaggression, placidness, serenity, armistice.
quiet (noun)
quiesce, subdued, serenity, lull, quieten, unruffled, restful, tranquility, slumbrous, tranquillize, relaxing, tranquillity, muted, catlike, soft, quiescent, tranquillise, tiptoe, noiseless, silent, hush, repose, placidity, stilly, quietly, calm, calm down, quiet down, soundless, tranquil, still, reposeful, untroubled, hushed, slumberous, dreamy, tranquilize, unpretentious, silence, pipe down, restrained, uneventful, placid, unostentatious.
repose (noun)
quiescence.
silence (noun)
inaudibility, soundlessness, muteness, dumbness, noiselessness.
state (noun)
lull.
temperance (noun)
moderation.
unostentatious (noun)
modest, unobtrusive.

v.

calm (verb)
assuage, still, allay, lull, placate, quell, console, sedate, appease.
make silent, calm (verb)
appease, soothe, slack, palliate, moderate, mollify, console, allay, calm down, shush, muffle, gag, silence, soften, muzzle, satisfy, assuage, reconcile, ameliorate, gratify, quieten, settle, tranquilize, relax, becalm, compose, pacify, subdue.
moderate (verb)
ease, moderate, calm, restrain, soothe, cool, alleviate, soften, compose, pacify, tranquilize, relax, abate, subdue.
pacify (verb)
ebb, stabilize, conciliate, mollify, reconcile, relieve, hush, smooth, defuse.
quiet (verb)
dull, turn down, silence, deaden, low, muffle.
rest (verb)
sleep, slumber, pause, stay, vegetate, settle down, fix, subside, settle, stagnate, mark time, stand, becalm, wait.
silence (verb)
shush.
soothe (verb)
comfort.

Other synonyms:

monotone, unobtrusive. slack, drown, economical. tasteful. brief, free. highlight, small. light. calm
becalm.
quieten
quieten.
reticent
taciturn, uncommunicative.
silence
choke off, shush.
soothe
soothe, soothing.
Other relevant words:
quieten, tranquillity, untroubled, pipe down, stilly, quiet down, unobtrusive.

Usage examples for quiet

  1. " But this won't keep quiet – Guy Garrick by Arthur B. Reeve
  2. Just you keep quiet old man, and you shall get out too. – Best Russian Short Stories by Various
  3. If you like, suppose we have a long, quiet talk some day alone. – The Girl Scouts in Beechwood Forest by Margaret Vandercook