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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
1590-1600; un-2 + deceive
Related forms
undeceivable, adjective
undeceiver, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for undeceive
Historical Examples
  • The Osmia considers herself at home; and the other does nothing to undeceive her.

    The Mason-bees J. Henri Fabre
  • He evidently thought his agent was still in the woods, and I was not disposed to undeceive him.

    Down South Oliver Optic
  • And that dear old captain would most likely imagine the worst without her being able to undeceive him.

    Bluebell Mrs. George Croft Huddleston
  • But as the General said: 'Even if that were so, it was kinder not to undeceive them.

    The Talking Horse F. Anstey
  • He is abused, And I must undeceive him—own my love, And heart and hand at his disposal lay.

    The Love-Chase James Sheridan Knowles
  • Nothing he can say or do, however, will undeceive these people.

  • He took me for Mary, do you see, Peter; and I was not going to undeceive him?

    Peter Trawl W. H. G. Kingston
  • "Because in that case it is due to her to undeceive her," he said.

    Mrs. Dud's Sister Josephine Daskam
  • He thought he was speaking to the same person that he had left in the chaise, and I did not undeceive him.

    The Memoires of Casanova, Complete Jacques Casanova de Seingalt
  • It may be as well for you to undeceive her of this as soon as she comes to her senses.

    The White Chief Mayne Reid
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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