to show to be false; contradict

His trembling hands belied his calm voice.

to misrepresent

The newspaper belied the facts.

to act unworthily according to the standards of (a tradition, one's ancestry, one's faith, etc.).

Archaic . to lie about; slander.

verb

attest , prove , be honest

verb

confute , contradict , contravene , controvert , deny , disaffirm , disagree , explode , gainsay , negate , negative , oppose , repudiate , color , conceal , disguise , distort , falsify , garble , give the lie to , gloss over , hide , miscolor , mislead , misrepresent , misstate , pervert , trump up , twist , warp , load , wrench , wrest , discredit , disprove , rebut , belong , besiege , betray , camouflage , counterfeit , deceive , defame , pertain , slander , surround