The Collaborative International Dictionary of English v.0.48:

Exhaust \Ex*haust"\, v. t. [imp. & p. p. Exhausted; p. pr. &
   vb. n. Exhausting.] [L. exhaustus, p. p. of exhaurire; ex
   out + haurire, haustum, to draw, esp. water; perhaps akin to
   Icel. asua to sprinkle, pump.]
   1. To draw or let out wholly; to drain off completely; as, to
      exhaust the water of a well; the moisture of the earth is
      exhausted by evaporation.
      [1913 Webster]

   2. To empty by drawing or letting out the contents; as, to
      exhaust a well, or a treasury.
      [1913 Webster]

   3. To drain, metaphorically; to use or expend wholly, or till
      the supply comes to an end; to deprive wholly of strength;
      to use up; to weary or tire out; to wear out; as, to
      exhaust one's strength, patience, or resources.
      [1913 Webster]

            A decrepit, exhausted old man at fifty-five.
                                                  --Motley.
      [1913 Webster]

   4. To bring out or develop completely; to discuss thoroughly;
      as, to exhaust a subject.
      [1913 Webster]

   5. (Chem.) To subject to the action of various solvents in
      order to remove all soluble substances or extractives; as,
      to exhaust a drug successively with water, alcohol, and
      ether.
      [1913 Webster]

   Exhausted receiver. (Physics) See under Receiver.

   Syn: To spend; consume; tire out; weary.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

exhausted \exhausted\ adj.
   1. same as burned-out, 1. [WordNet sense 1+3]

   Syn: burned-out(prenominal), burnt-out(prenominal), burned
        out(predicate), burnt out(predicate), fagged, fatigued,
        played-out(prenominal), played out(predicate), spent,
        washed-out(prenominal), washed out(predicate),
        worn-out(prenominal), worn out(predicate).
        [WordNet 1.5]

   2. used up; completely consumed. [WordNet sense 2][Narrower
      terms: gone, expended, spent] WordNet 1.5 +PJC]

   3. emptied by being pumped out or having a vacuum created.
      Opposite of unexhausted.

   Syn: exhausted, evacuated.
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

exhausted
    adj 1: drained of energy or effectiveness; extremely tired;
           completely exhausted; "the day's shopping left her
           exhausted"; "he went to bed dog-tired"; "was fagged and
           sweaty"; "the trembling of his played out limbs"; "felt
           completely washed-out"; "only worn-out horses and
           cattle"; "you look worn out" [syn: exhausted, dog-
           tired, fagged, fatigued, played out, spent,
           washed-out, worn-out(a), worn out(p)]
    2: depleted of energy, force, or strength; "impossible to grow
       tobacco on the exhausted soil"; "the exhausted food sources";
       "exhausted oil wells" [syn: exhausted, spent] [ant:
       unexhausted]
    3: drained physically; "the day's events left her completely
       exhausted--her strength drained"

Moby Thesaurus II by Grady Ward, 1.0:

140 Moby Thesaurus words for "exhausted":
   ablated, acarpous, all in, arid, at an end, ausgespielt, bare,
   barren, beat, beat up, beaten, bleary, bone-weary, burned-out,
   burnt up, bushed, cachectic, celibate, childless, consumed, dead,
   dead-and-alive, dead-tired, deadbeat, debilitated, depleted,
   desert, desolate, devitalized, disabled, dissipated, dog-tired,
   dog-weary, done, done in, done up, drained, dried-up, dry,
   eaten up, effete, emptied, empty, enervated, enfeebled, eroded,
   eviscerated, fagged out, failing, fallow, far-gone, fatigued,
   feeble, finished, frail, frazzled, fruitless, gaunt, gelded, gone,
   healthless, impotent, impoverished, in poor health, incapacitated,
   ineffectual, infecund, infertile, infirm, invalid, issueless,
   jaded, jejune, knocked out, laid low, languishing, leached, limp,
   menopausal, moribund, nonfertile, nonproducing, nonproductive,
   nonprolific, pale, peaked, peaky, played out, pooped, pooped out,
   poor, prostrate, ready to drop, reduced, reduced in health,
   run-down, sapped, shotten, sickly, sine prole, spent, sterile,
   sucked dry, teemless, tired, tired out, tired to death,
   tuckered out, uncultivated, unfertile, unfruitful, unhealthy,
   unplowed, unproductive, unprolific, unsound, unsown, untilled,
   used up, valetudinarian, valetudinary, virgin, washed-out,
   washed-up, waste, wasted, weak, weakened, weakly, wearied, weary,
   weary unto death, whacked, wiped out, with low resistance,
   without issue, worn, worn away, worn out, worn-out