The Collaborative International Dictionary of English v.0.48:

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.
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            They . . . were quiet all the night, saying, In the
            morning, when it is day, we shall kill him. --Judg.
                                                  xvi. 2.
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   2. Free from noise or disturbance; hushed; still.
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   3. Not excited or anxious; calm; peaceful; placid; settled;
      as, a quiet life; a quiet conscience. " So quiet and so
      sweet a style." --Shak.
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            That son, who on the quiet state of man
            Such trouble brought.                 --Milton.
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   4. Not giving offense; not exciting disorder or trouble; not
      turbulent; gentle; mild; meek; contented.
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            The ornament of a meek and quiet spirit. --1 Pet.
                                                  iii. 4.
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            I will sit as quiet as a lamb.        --Shak.
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   5. Not showy; not such as to attract attention;
      undemonstrative; as, a quiet dress; quiet colors; a quiet
      movement.
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   Syn: Still; tranquil; calm; unruffled; smooth; unmolested;
        undisturbed; placid; peaceful; mild; peaceable; meek;
        contented.
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The Collaborative International Dictionary of English v.0.48:

Quieter \Qui"et*er\, n.
   One who, or that which, quiets.
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