The Collaborative International Dictionary of English v.0.48:

Want \Want\, v. t. [imp. & p. p. Wanted; p. pr. & vb. n.
   Wanting.]
   [1913 Webster]
   1. To be without; to be destitute of, or deficient in; not to
      have; to lack; as, to want knowledge; to want judgment; to
      want learning; to want food and clothing.
      [1913 Webster]

            They that want honesty, want anything. --Beau. & Fl.
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            Nor think, though men were none,
            That heaven would want spectators, God want praise.
                                                  --Milton.
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            The unhappy never want enemies.       --Richardson.
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   2. To have occasion for, as useful, proper, or requisite; to
      require; to need; as, in winter we want a fire; in summer
      we want cooling breezes.
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   3. To feel need of; to wish or long for; to desire; to crave.
      " What wants my son?" --Addison.
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            I want to speak to you about something. --A.
                                                  Trollope.
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The Collaborative International Dictionary of English v.0.48:

Wanting \Want"ing\, a.
   Absent; lacking; missing; also, deficient; destitute; needy;
   as, one of the twelve is wanting; I shall not be wanting in
   exertion.
   [1913 Webster]
   [1913 Webster]

WordNet (r) 3.0 (2006):

wanting
    adj 1: nonexistent; "the thumb is absent"; "her appetite was
           lacking" [syn: lacking, absent, missing, wanting]
    2: inadequate in amount or degree; "a deficient education";
       "deficient in common sense"; "lacking in stamina"; "tested
       and found wanting" [syn: deficient, lacking(p),
       wanting(p)]

Moby Thesaurus II by Grady Ward, 1.0:

131 Moby Thesaurus words for "wanting":
   absconded, absent, adulterated, appetitive, arrested, away,
   bankrupt in, bare of, bereaved, bereaved of, bereft, bereft of,
   blemished, callow, cut off, damaged, defective, deficient, deleted,
   denuded, denuded of, departed, deprived of, desiderative,
   desireful, desiring, desirous, destitute of, devoid of,
   disappeared, divested, eager, embryonic, empty of, erroneous,
   failing, fallible, fate, faulty, for want of, forlorn of,
   found wanting, gone, half-assed, hoping, hormic, hypoplastic,
   immature, impaired, imperfect, imprecise, impure, in arrear,
   in arrears, in default, in default of, in short supply, in want of,
   inaccurate, inadequate, incompetent, incomplete, inexact, infant,
   inferior, insufficient, lacking, lascivious, libidinal, libidinous,
   lickerish, lustful, makeshift, mediocre, minus, missing, mixed,
   needing, no longer present, nonattendant, nonexistent, not enough,
   not found, not perfect, not present, off, omitted, optative,
   out of, out of pocket, out of sight, part, parted from, partial,
   patchy, robbed of, sans, scant, scant of, scanty, scarce, scrappy,
   shorn of, short, short of, shy, shy of, sketchy, stripped of,
   subtracted, taken away, tempted, too little, unblessed with,
   underdeveloped, undeveloped, unequal to, uneven, unfinished,
   unperfected, unpossessed of, unqualified, unreached,
   unsatisfactory, unsatisfying, unsound, unsufficing, unthorough,
   vanished, void of, wishing