sedate

from WordNet (r) 3.0 (2006)
sedate
    adj 1: characterized by dignity and propriety [syn: {sedate},
           {staid}]
    2: dignified and somber in manner or character and committed to
       keeping promises; "a grave God-fearing man"; "a quiet sedate
       nature"; "as sober as a judge"; "a solemn promise"; "the
       judge was solemn as he pronounced sentence" [syn: {grave},
       {sedate}, {sober}, {solemn}]
    v 1: cause to be calm or quiet as by administering a sedative
         to; "The patient must be sedated before the operation"
         [syn: {sedate}, {calm}, {tranquilize}, {tranquillize},
         {tranquillise}] [ant: {arouse}, {brace}, {energise},
         {energize}, {perk up}, {stimulate}]
    
from The Collaborative International Dictionary of English v.0.48
Sedate \Se*date"\, a. [L. sedatus, p. p. of sedare, sedatum, to
   allay, calm, causative of sedere to sit. See {Sit}.]
   Undisturbed by passion or caprice; calm; tranquil; serene;
   not passionate or giddy; composed; staid; as, a sedate soul,
   mind, or temper.
   [1913 Webster]

         Disputation carries away the mind from that calm and
         sedate temper which is so necessary to contemplate
         truth.                                   --I. Watts.
   [1913 Webster]

         Whatsoever we feel and know
         Too sedate for outward show.             --Wordsworth.
   [1913 Webster]

   Syn: Settled; composed; calm; quiet; tranquil; still; serene;
        unruffled; undisturbed; contemplative; sober; serious.
        [1913 Webster] -- {Se*date"ly}, adv. -- {Se*date"ness},
        n.
        [1913 Webster]
    
from Moby Thesaurus II by Grady Ward, 1.0
84 Moby Thesaurus words for "sedate":
      anesthetize, aristocratic, august, calm, collected, composed,
      controlled, conventional, cool, courtly, decorous, demure,
      detached, dignified, dispassionate, dope, drug, earnest, entrance,
      even-tempered, formal, frowning, fussy, grand, grave, grim,
      grim-faced, grim-visaged, hypnotize, imperturbable, imposing,
      kingly, long-faced, lordly, lull to sleep, magisterial, magnetize,
      majestic, mesmerize, moderate, narcotize, no-nonsense, noble,
      old-fashioned, peaceful, placid, prim, princely, proper, prudish,
      put to sleep, put under, queenly, refined, regal, rock to sleep,
      royal, seemly, serene, serious, sober, sober-minded, sobersided,
      solemn, somber, staid, stately, statuesque, stiff, stone-faced,
      straight-faced, strait-laced, temperate, thoughtful, trance,
      tranquil, undisturbed, unflappable, unperturbed, unruffled,
      unsmiling, venerable, weighty, worthy

    

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