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See more synonyms for undeceive on Thesaurus.com
verb (used with object), un·de·ceived, un·de·ceiv·ing.
  1. to free from deception, fallacy, or mistake.
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Origin of undeceive

First recorded in 1590–1600; un-2 + deceive
Related formsun·de·ceiv·a·ble, adjectiveun·de·ceiv·er, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for undeceive

Historical Examples

  • (To Argan) Sir, allow me to undeceive him, and to show him his mistake.

    The Imaginary Invalid


  • It will be easy to undeceive the man—later—when you are saved.

    Night and Morning, Complete

    Edward Bulwer-Lytton

  • I hope that she is under a delusion: it will be easy for you to undeceive her.

    A Hero of Our Time

    M. Y. Lermontov

  • To no end did Nelly try to undeceive her father on this head.

  • Yet I would not undeceive her, for I wanted her to bring matters to a climax.

    The Memoires of Casanova, Complete

    Jacques Casanova de Seingalt

British Dictionary definitions for undeceive


  1. (tr) to reveal the truth to (someone previously misled or deceived); enlighten
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Derived Formsundeceivable, adjectiveundeceiver, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012