verb (used with object)
to free from or deprive of illusion, belief, idealism, etc.; disenchant.
a freeing or a being freed from illusion or conviction; disenchantment.

1590–1600; dis-1 + illusion

disillusionment, noun
disillusive [dis-i-loo-siv] , adjective
undisillusioned, adjective

1. disabuse, disenthrall, undeceive, disappoint.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
disillusion (ˌdɪsɪˈluːʒən)
1.  (tr) to destroy the ideals, illusions, or false ideas of
2.  the act of disillusioning or the state of being disillusioned

disillusioned (ˌdɪsɪˈluːʒənd)
having lost one's ideals, illusions, or false ideas about someone or something; disenchanted

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"to free or be freed from illusion," 1851, from dis- + illusion (q.v.). Related: Disillusioned; disillusionment.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Spy fiction falls into two categories: the preposterous and the disillusioned.
Fortunately for my academic career, he became increasingly disillusioned with
  the scholarly life and left to pursue other work.
Disillusioned investors have turned from shares to housing.
Perhaps being beat to the punch on whoopie pies left them disillusioned.
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