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[uhn-di-seev] /ˌʌn dɪˈsiv/
verb (used with object), undeceived, undeceiving.
to free from deception, fallacy, or mistake.
Origin of undeceive
First recorded in 1590-1600; un-2 + deceive
Related forms
undeceivable, adjective
undeceiver, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for undeceive
Historical Examples
  • (To Argan) Sir, allow me to undeceive him, and to show him his mistake.

  • 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.

    The Daltons, Volume II (of II) Charles James Lever
  • 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
  • Possibly I should have been wise not to undeceive him on this account.

    The Memoires of Casanova, Complete Jacques Casanova de Seingalt
  • Now thinking it best to undeceive her, "It is no dream, my dear," returned Miss Woodley.

    A Simple Story Mrs. Inchbald
  • I am sorry to undeceive you, but it is indeed the truth I speak.

    Molly Bawn Margaret Wolfe Hamilton
  • Man may weave, but she will undeceive; man may arrange, but God will dispose.

    Ernest Linwood Caroline Lee Hentz
  • Well, it was pretty trying, but Davies strove to explain and to undeceive.

    Under Fire Charles King
British Dictionary definitions for undeceive


(transitive) to reveal the truth to (someone previously misled or deceived); enlighten
Derived Forms
undeceivable, adjective
undeceiver, 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
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