The Collaborative International Dictionary of English v.0.48:

Confound \Con*found"\ (k[o^]n*found"), v. t. [imp. & p. p.
   Confounded; p. pr. & vb. n. Confounding.] [F. confondre,
   fr. L. confundere, -fusum, to pour together; con- + fundere
   to pour. See Fuse to melt, and cf. Confuse.]
   1. To mingle and blend, so that different elements can not be
      distinguished; to confuse.
      [1913 Webster]

            They who strip not ideas from the marks men use for
            them, but confound them with words, must have
            endless dispute.                      --Locke.
      [1913 Webster]

            Let us go down, and there confound their language.
                                                  --Gen. xi. 7.
      [1913 Webster]

   2. To mistake for another; to identify falsely.
      [1913 Webster]

            They [the tinkers] were generally vagrants and
            pilferers, and were often confounded with the
            gypsies.                              --Macaulay.
      [1913 Webster]

   3. To throw into confusion or disorder; to perplex; to strike
      with amazement; to dismay.
      [1913 Webster]

            The gods confound...
            The Athenians both within and out that wall. --Shak.
      [1913 Webster]

            They trusted in thee and were not confounded. --Ps.
                                                  xxii. 5.
      [1913 Webster]

            So spake the Son of God, and Satan stood
            A while as mute, confounded what to say. --Milton.
      [1913 Webster]

   4. To destroy; to ruin; to waste. [Obs.]
      [1913 Webster]

            One man's lust these many lives confounds. --Shak.
      [1913 Webster]

            How couldst thou in a mile confound an hour? --Shak.

   Syn: To abash; confuse; baffle; dismay; astonish; defeat;
        terrify; mix; blend; intermingle. See Abash.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Confounded \Con*found"ed\, a.
   1. Confused; perplexed; unclear in mind or intent;
      bewildered.

   Syn: at sea, befuddled, bemused, bewildered, confused, mazed,
        mixed-up.
        [1913 Webster + WordNet 1.5]

              A cloudy and confounded philosopher. --Cudworth.
        [1913 Webster]

   2. Excessive; extreme; abominable. [Colloq.]
      [1913 Webster]

            He was a most confounded tory.        --Swift.
      [1913 Webster]

            The tongue of that confounded woman.  --Sir. W.
                                                  Scott.
      [1913 Webster]

WordNet (r) 3.0 (2006):

confounded
    adj 1: perplexed by many conflicting situations or statements;
           filled with bewilderment; "obviously bemused by his
           questions"; "bewildered and confused"; "a cloudy and
           confounded philosopher"; "just a mixed-up kid"; "she felt
           lost on the first day of school" [syn: baffled,
           befuddled, bemused, bewildered, confounded,
           confused, lost, mazed, mixed-up, at sea]

Moby Thesaurus II by Grady Ward, 1.0:

191 Moby Thesaurus words for "confounded":
   Byzantine, absolute, addled, agape, aghast, agog, all agog,
   all up with, amazed, astonished, astounded, at a loss, at gaze,
   awed, awestruck, baffled, balled up, bamboozled, beat, beaten,
   beguiled, belied, bested, bewildered, bewitched, blamed,
   blankety-blank, blasted, blessed, breathless, buffaloed,
   captivated, complex, complicated, confused, confuted, convoluted,
   crabbed, cursed, cussed, dadburned, daedal, danged, darned, dashed,
   dazed, defeated, deflated, denied, deuced, devious, discarded,
   discomfited, discredited, dismayed, dismissed, disproved, disputed,
   doggone, doggoned, done for, done in, down, dumbfounded,
   dumbstruck, elaborate, embrangled, enchanted, enraptured,
   enravished, entangled, enthralled, entranced, execrable, exploded,
   exposed, fallen, fascinated, fixed, flabbergasted, floored,
   fouled up, fuddled, gaping, gauping, goldarned, goshdarn, gross,
   hors de combat, hypnotized, implicated, impugned, in a dilemma,
   in awe, in awe of, in suspense, infernal, intricate, invalidated,
   involuted, involved, knotted, labyrinthian, labyrinthine,
   lambasted, lathered, licked, lost in wonder, loused up,
   many-faceted, marveling, matted, mazy, meandering, mesmerized,
   messed up, mixed up, mucked up, muddled, multifarious, mystified,
   negated, negatived, nonplussed, on tenterhooks, on the skids,
   open-eyed, openmouthed, out-and-out, outdone, outright, overborne,
   overcome, overmastered, overmatched, overpowered, overridden,
   overthrown, overturned, overwhelmed, panicked, perplexed, popeyed,
   punctured, put to rout, puzzled, ramified, rank, rapt in wonder,
   refuted, rejected, roundabout, routed, ruddy, ruined, scattered,
   screwed up, settled, shocked, shown up, silenced, skinned,
   skinned alive, snarled, spellbound, staggered, stampeded, staring,
   straight-out, stuck, stumped, stupefied, subtle, surprised,
   tangled, tangly, thrown, thunderstruck, trimmed, trounced, twisted,
   under a charm, undone, unmitigated, upset, whelmed, whipped,
   wide-eyed, wonder-struck, wondering, worsted