quiet (n.)

c. 1300, "freedom from disturbance or conflict; calm, stillness," from Old French quiete "rest, repose, tranquility" and directly from Latin quies (genitive quietis) "a lying still, rest, repose, peace," from PIE root *kweie- "to rest, be quiet." Late 14c. as "inactivity, rest, repose."

quiet (adj.)

late 14c., "peaceable, at rest, restful, tranquil," from Old French quiet and directly from Latin quietus "calm, at rest, free from exertion," from quies (genitive quietis) "rest," from PIE root *kweie- "to rest, be quiet." As an adverb from 1570s. Related: Quietly; quietness.

quiet (v.)

late 14c., "subdue, lessen," from quiet (adj.) and in part from Latin quietare. From mid-15c. as "to make silent, cause to be quiet;" intransitive sense of "become quiet, be silent" is from 1791. Related: Quieted; quieting.

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Definitions of quiet from WordNet
quiet (adj.)
characterized by an absence or near absence of agitation or activity;
quiet peace-loving people
a quiet life
the factions remained quiet for almost 10 years
a quiet throng of onlookers
quiet (adj.)
free of noise or uproar; or making little if any sound;
a quiet audience at the concert
the room was dark and quiet
quiet (adj.)
not showy or obtrusive;
clothes in quiet good taste
Synonyms: restrained
quiet (adj.)
in a softened tone;
a quiet reprimand
Synonyms: hushed / muted / subdued
quiet (adj.)
(of a body of water) free from disturbance by heavy waves;
the quiet waters of a lagoon
Synonyms: placid / still / tranquil / smooth / unruffled
quiet (adj.)
(of the sun) characterized by a low level of surface phenomena, such as sunspots;
quiet (n.)
a period of calm weather;
Synonyms: lull
quiet (n.)
an untroubled state; free from disturbances;
Synonyms: tranquillity / tranquility
quiet (n.)
the absence of sound;
the street was quiet
Synonyms: silence
quiet (n.)
a disposition free from stress or emotion;
Synonyms: repose / placidity / serenity / tranquillity / tranquility
quiet (v.)
become quiet or quieter;
Synonyms: quieten / hush / quiesce / quiet down / pipe down
quiet (v.)
make calm or still;
quiet the dragons of worry and fear
Synonyms: calm / calm down / tranquilize / tranquillize / tranquillise / quieten / lull / still
quiet (adv.)
with little or no activity or no agitation (`quiet' is a nonstandard variant for `quietly');
sit here as quiet as you can
Synonyms: quietly