The Collaborative International Dictionary of English v.0.48:

Belie \Be*lie"\, v. t. [imp. & p. p. Belied; p. pr. & vb. n.
   Belying.] [OE. bilien, bili?en, AS. bele['o]gan; pref. be-
   + le['o]gan to lie. See Lie, n.]
   1. To show to be false; to convict of, or charge with,
      falsehood.
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            Their trembling hearts belie their boastful tongues.
                                                  --Dryden.
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   2. To give a false representation or account of.
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            Should I do so, I should belie my thoughts. --Shak.
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   3. To tell lie about; to calumniate; to slander.
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            Thou dost belie him, Percy, thou dost belie him.
                                                  --Shak.
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   4. To mimic; to counterfeit. [Obs.] --Dryden.
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   5. To fill with lies. [Obs.] "The breath of slander doth
      belie all corners of the world." --Shak.
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WordNet (r) 3.0 (2006):

belie
    v 1: be in contradiction with [syn: contradict, belie,
         negate]
    2: represent falsely; "This statement misrepresents my
       intentions" [syn: misrepresent, belie]

Moby Thesaurus II by Grady Ward, 1.0:

95 Moby Thesaurus words for "belie":
   abjure, assert the contrary, be contrary to, blow sky-high,
   blow up, burlesque, call into question, camouflage, caricature,
   challenge, color, conceal, contest, contradict, contravene,
   controvert, counter, cross, deflate, deny, disaffirm, disallow,
   disavow, disclaim, disconfirm, discredit, disguise, disown,
   disprove, dispute, distort, dress up, embellish, embroider,
   exaggerate, explode, expose, falsify, forswear, fudge, gainsay,
   garble, gild, gloss, gloss over, hide, impugn, invalidate,
   join issue upon, mask, miscite, miscolor, misquote, misreport,
   misrepresent, misstate, misteach, negate, negative, not accept,
   not admit, nullify, oppose, oppugn, overdraw, overstate, parody,
   pervert, prove the contrary, puncture, rebut, recant,
   refuse to admit, refute, reject, renounce, repudiate, retract,
   revoke, show up, slant, strain, take back, take issue with,
   titivate, traverse, travesty, trick out, twist, undercut,
   understate, varnish, warp, whitewash, wrench