The Collaborative International Dictionary of English v.0.48:

Confuse \Con*fuse"\, a. [F. confus, L. confusus, p. p. of
   confundere. See Confound.]
   Mixed; confounded. [Obs.] --Baret.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Confuse \Con*fuse"\, v. t. [imp. & p. p. Confused; p. pr. &
   vb. n. Confusing.]
   1. To mix or blend so that things can not be distinguished;
      to jumble together; to confound; to render indistinct or
      obscure; as, to confuse accounts; to confuse one's vision.
      [1913 Webster]

            A universal hubbub wild
            Of stunning sounds and voices all confused.
                                                  --Milton.
      [1913 Webster]

   2. To perplex; to disconcert; to abash; to cause to lose
      self-possession.
      [1913 Webster]

            Nor thou with shadowed hint confuse
            A life that leads melodious days.     --Tennyson.
      [1913 Webster]

            Confused and sadly she at length replied. --Pope.

   Syn: To abash; disorder; disarrange; disconcert; confound;
        obscure; distract. See Abash.
        [1913 Webster]

WordNet (r) 3.0 (2006):

confuse
    v 1: mistake one thing for another; "you are confusing me with
         the other candidate"; "I mistook her for the secretary"
         [syn: confuse, confound]
    2: be confusing or perplexing to; cause to be unable to think
       clearly; "These questions confuse even the experts"; "This
       question completely threw me"; "This question befuddled even
       the teacher" [syn: confuse, throw, fox, befuddle,
       fuddle, bedevil, confound, discombobulate]
    3: cause to feel embarrassment; "The constant attention of the
       young man confused her" [syn: confuse, flurry,
       disconcert, put off]
    4: assemble without order or sense; "She jumbles the words when
       she is supposed to write a sentence" [syn: jumble,
       confuse, mix up]
    5: make unclear, indistinct, or blurred; "Her remarks confused
       the debate"; "Their words obnubilate their intentions" [syn:
       confuse, blur, obscure, obnubilate]

Moby Thesaurus II by Grady Ward, 1.0:

129 Moby Thesaurus words for "confuse":
   abash, addle, addle the wits, agitate, baffle, ball up, becloud,
   bedazzle, befog, befuddle, bemuse, bewilder, blur,
   blur distinctions, bollix up, botch, bother, buffalo, bug, cap,
   cast down, chagrin, cloud, color, complicate, confound, daze,
   dazzle, deform, derange, disarrange, discombobulate, discomfit,
   discompose, disconcert, discountenance, dishevel, dismay, disorder,
   disorganize, disorient, disquiet, distort, distract, disturb,
   dizzy, embarrass, embrangle, ensnarl, entangle, faze, flummox,
   flurry, fluster, flutter, fog, fog up, foul up, fuddle, fumble,
   fuss, fuzz, garble, implicate, involve, jumble, jumble together,
   knock galley-west, knot, louse up, make uncertain, maze, mess up,
   miscolor, misdeem, misguide, misidentify, mislead, mist, mix,
   mix up, mizzle, moider, mortify, muck up, muddle, muddy, mull,
   mystify, obfuscate, obscure, overlook distinctions, perplex,
   perturb, pervert, pi, play hob with, pose, pother, put out, puzzle,
   raise hell, ramify, rattle, ravel, riffle, ruffle, scramble,
   screw up, shame, shuffle, snafu, snarl, snarl up, stumble, tangle,
   throw, throw into confusion, throw off, throw out, tumble, twist,
   unform, unsettle, unshape, upset, warp, wrench, wrest