[syn: unplayful, serious, sober]
The Collaborative International Dictionary of English v.0.48:
Sober \Sober\, a. [Compar. Soberer; superl. Soberest.] [OE.
   sobre, F. sobre, from L. sobrius, probably from a prefix so-
   expressing separation + ebrius drunken. Cf. Ebriety.]
   1. Temperate in the use of spirituous liquors; habitually
      temperate; as, a sober man.
      [1913 Webster]
            That we may hereafter live a godly, righteous, and
            sober life, to the glory of Thy holy name. --Bk. of
                                                  Com. Prayer.
      [1913 Webster]
   2. Not intoxicated or excited by spirituous liquors; as, the
      sot may at times be sober.
      [1913 Webster]
   3. Not mad or insane; not wild, visionary, or heated with
      passion; exercising cool, dispassionate reason;
      self-controlled; self-possessed.
      [1913 Webster]
            There was not a sober person to be had; all was
            tempestuous and blustering. --Druden.
      [1913 Webster]
            No sober man would put himself into danger for the
            applause of escaping without breaking his neck.
                                                  --Dryden.
      [1913 Webster]
   4. Not proceeding from, or attended with, passion; calm; as,
      sober judgment; a man in his sober senses.
      [1913 Webster]
   5. Serious or subdued in demeanor, habit, appearance, or
      color; solemn; grave; sedate.
      [1913 Webster]
            What parts gay France from sober Spain? --Prior.
      [1913 Webster]
            See her sober over a sampler, or gay over a jointed
            baby.                                 --Pope.
      [1913 Webster]
            Twilight gray
            Had in her sober livery all things clad. --Milton.
      [1913 Webster]
   Syn: Grave; temperate; abstinent; abstemious; moderate;
        regular; steady; calm; quiet; cool; collected;
        dispassionate; unimpassioned; sedate; staid; serious;
        solemn; somber. See Grave.
        [1913 Webster]
The Collaborative International Dictionary of English v.0.48:
Sober \So"ber\, v. t. [imp. & p. p. Sobered; p. pr. & vb. n.
   Sobering.]
   To make sober.
   [1913 Webster]
         There shallow draughts intoxicate the brain,
         And drinking largely sobers us again.    --Pope.
   [1913 Webster]
The Collaborative International Dictionary of English v.0.48:
Sober \So"ber\, v. i.
   To become sober; -- often with down.
   [1913 Webster]
         Vance gradually sobered down.            --Ld. Lytton.
   [1913 Webster]
WordNet (r) 3.0 (2006):
sober
    adj 1: not affected by a chemical substance (especially alcohol)
           [ant: drunk, inebriated, intoxicated]
    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]
    3: lacking brightness or color; dull; "drab faded curtains";
       "sober Puritan grey"; "children in somber brown clothes"
       [syn: drab, sober, somber, sombre]
    4: completely lacking in playfulness [syn: unplayful,
       serious, sober] [ant: playful]
    v 1: cause to become sober; "A sobering thought"
    2: become more realistic; "After thinking about the potential
       consequences of his plan, he sobered up" [syn: sober up,
       sober]
    3: become sober after excessive alcohol consumption; "Keep him
       in bed until he sobers up" [syn: sober up, sober]
Moby Thesaurus II by Grady Ward, 1.0:
298 Moby Thesaurus words for "sober":
   Quaker-colored, Spartan, abstaining, abstentious, abstinent, acier,
   aristocratic, ascetic, ashen, ashy, august, austere, awe-inspiring,
   balanced, bald, bare, blackish, bland, calm, candid, canescent,
   cinereous, cinerous, cogitative, cognitive, cold sober, collected,
   colorless, common, commonplace, commonsense, composed,
   concentrating, concentrative, conceptive, conceptual,
   conceptualized, constrained, contemplating, contemplative,
   continent, controlled, cool, coolheaded, courtly, creamy, dapple,
   dapple-gray, dappled, dappled-gray, dark, dark-colored, darkish,
   darksome, decorous, deliberating, deliberative, delicate, demure,
   detoxify, dignified, dingy, direct, disciplined, dismal,
   dispassionate, dove-colored, dove-gray, down-to-earth, drab,
   dreary, dry, dull, dusk, dusky, dusty, earnest, eggshell,
   eschewing, excogitating, fatal, fateful, flat, forbearing,
   forgoing, formal, formidable, frank, frowning, frugal, funereal,
   gentle, glaucescent, glaucous, gloss, grand, grave, gray,
   gray-black, gray-brown, gray-colored, gray-drab, gray-green,
   gray-spotted, gray-toned, gray-white, grayed, grayish, grim,
   grim-faced, grim-visaged, griseous, grizzle, grizzled, grizzly,
   hard, hard-boiled, hardheaded, heavy, homely, homespun, ideative,
   imperturbable, imposing, inhibited, introspective, iridescent,
   iron-gray, judicious, kingly, lead-gray, leaden, lean,
   level-headed, levelheaded, light, livid, logical, long-faced,
   lordly, low-key, magisterial, majestic, matter-of-fact, measured,
   meditating, meditative, mellow, mental, mild, mild as milk,
   moderate, mother-of-pearl, mouse-colored, mouse-gray, mousy,
   museful, musing, nacreous, natural, neat, neutral, nigrescent,
   no-nonsense, noble, noetic, nonviolent, opalescent, open,
   pacifistic, pale, pastel, patinaed, peaceable, peaceful, pearl,
   pearl-gray, pearly, pensive, philosophical, placid, plain,
   plain-speaking, plain-spoken, pondering, portentous, practical,
   pragmatic, prehensive, princely, proper, prosaic, prosing, prosy,
   prudent, pure, queenly, quiet, rational, realistic, reasonable,
   recover, reflecting, reflective, refraining, regal, repressed,
   reserved, restrained, royal, ruminant, ruminating, ruminative,
   rustic, sad, sane, sedate, self-controlled, self-disciplined,
   self-possessed, semigloss, sensible, serene, serious, severe,
   silver, silver-gray, silvered, silvery, simple, simple-speaking,
   slate-colored, slaty, smoke-gray, smoky, sober-minded, sobersided,
   soft, soft-colored, soft-hued, softened, solemn, somber, sombrous,
   sound, spare, sparing, speculative, staid, stark, stately,
   statuesque, steady, steel-gray, steely, stinting, stone-colored,
   stone-faced, straight-faced, straightforward, subdued, subtle,
   swart, swarthy, sweet, tame, taupe, teetotal, temperate, tender,
   thinking, thought, thoughtful, together, tranquil, unadorned,
   unaffected, undrunk, undrunken, unexcited, unflustered,
   unidealistic, unimaginative, unimpassioned, uninebriate,
   uninebrious, unintoxicated, unperturbed, unpoetical, unruffled,
   unsmiling, untipsy, unvarnished, venerable, weighty, well-balanced,
   wistful, worthy