Source : Webster's Revised Unabridged Dictionary (1913)

Quiet \Qui"et\, n. [L. quies, -etis. See {Quiet}, a.]
   1. The quality or state of being quiet, or in repose; as an
      hour or a time of quiet.

   2. Freedom from disturbance, noise, or alarm; stillness;
      tranquillity; peace; security.

            And join with thee, calm Peace and Quiet. --Milton.

   {At quiet}, still; peaceful.

   {In quiet}, quietly. `` I will depart in quiet.'' --Shak.

   {Out of quiet}, disturbed; restless. [Obs.] ``She is much out
      of quiet.'' --Shak.

Quiet \Qui"et\, a. [Compar. {Quieter}; superl. {Quietest}.] [L.
   quietus, p. p. pf quiescere to rest, keep quiet; akin to
   quies rest, and prob. to E. while, n. See {While}, and cf.
   {Coy}, a., {Quiesce}, {Quietus}, {Quit}, a., {Quite},
   {Requiem}.]
   1. In a state of rest or calm; without stir, motion, or
      agitation; still; as, a quiet sea; quiet air.

            They . . . were quiet all the night, saying, In the
            morning, when it is day, we shall kill him. --Judg.
                                                  xvi. 2.

   2. Free from noise or disturbance; hushed; still.

   3. Not excited or anxious; calm; peaceful; placid; settled;
      as, a quiet life; a quiet conscience. `` So quiet and so
      sweet a style.'' --Shak.

            That son, who on the quiet state of man Such trouble
            brought.                              --Milton.

   4. Not giving offense; not exciting disorder or trouble; not
      turbulent; gentle; mild; meek; contented.

            The ornament of a meek and quiet spirit. --1 Pet.
                                                  iii. 4.

            I will sit as quiet as a lamb.        --Shak.

   5. Not showy; not such as to attract attention;
      undemonstrative; as, a quiet dress; quiet colors; a quiet
      movement.

   Syn: Still; tranquil; calm; unruffled; smooth; unmolested;
        undisturbed; placid; peaceful; mild; peaceable; meek;
        contented.

Quiet \Qui"et\, v. t. [imp. & p. p. {Quieted}; p. pr. & vb. n.
   {Quieting}.]
   1. To stop motion in; to still; to reduce to a state of rest,
      or of silence.

   2. To calm; to appease; to pacify; to lull; to allay; to
      tranquillize; as, to quiet the passions; to quiet clamors
      or disorders; to quiet pain or grief.

            Quiet yourselves, I pray, and be at peace. --Shak.

Quiet \Qui"et\, v. i.
   To become still, silent, or calm; -- often with down; as, be
   soon quieted down.

Source : WordNet®

quiet
     adj 1: characterized by an absence or near absence of agitation or
            activity; "a quiet life"; "a quiet throng of
            onlookers"; "quiet peace-loving people"; "the factions
            remained quiet for almost 10 years" [ant: {unquiet}]
     2: free of noise or uproar; or making little if any sound; "a
        quiet audience at the concert"; "the room was dark and
        quiet" [ant: {noisy}]
     3: not showy or obtrusive; "clothes in quiet good taste" [syn:
        {restrained}]
     4: in a softened tone; "hushed voices"; "muted trumpets"; "a
        subdued whisper"; "a quiet reprimand" [syn: {hushed}, {muted},
         {subdued}]
     5: without untoward incident or disruption; "a placid
        existence"; "quiet times" [syn: {placid}]
     6: free from disturbance; "a ribbon of sand between the angry
        sea and the placid bay"; "the quiet waters of a lagoon";
        "a lake of tranquil blue water reflecting a tranquil blue
        sky"; "a smooth channel crossing"; "scarcely a ripple on
        the still water"; "unruffled water" [syn: {placid}, {still},
         {tranquil}, {unruffled}]
     7: of the sun; characterized by a low level of surface
        phenomena like sun spots e.g. [ant: {active}]

quiet
     v 1: become quiet or quieter; "The audience fell silent when the
          speaker entered" [syn: {quieten}, {hush}, {quiesce}, {quiet
          down}, {pipe down}] [ant: {louden}]
     2: make calm or still; "quiet the dragons of worry and fear"
        [syn: {calm}, {calm down}, {tranquilize}, {tranquillize},
        {tranquillise}, {quieten}, {lull}, {still}] [ant: {agitate}]

quiet
     n 1: a period of calm weather; "there was a lull in the storm"
          [syn: {lull}]
     2: an untroubled state; free from disturbances [syn: {tranquillity}]
     3: the absence of sound; "he needed silence in order to sleep";
        "the street was quiet" [syn: {silence}] [ant: {sound}]
     4: a disposition free from stress or emotion [syn: {repose}, {placidity},
         {serenity}, {tranquillity}, {tranquility}]

quiet
     adv : with little or no activity or no agitation (`quiet' is a
           nonstandard variant for `quietly'); "her hands rested
           quietly in her lap"; "the rock star was quietly led out
           the back door"; "sit here as quiet as you can" [syn: {quietly}]
           [ant: {unquietly}]