disillusion

UK: /ˌdɪsɪˈluːʒ^ən/ US: /ˌdɪsɪˈluʒən/ ,(dis′i lo̅o̅′zhən)

WordReference Random House Learner's Dictionary of American English © 2025

dis•il•lu•sion /ˌdɪsɪˈluʒən/   v. [~ + object]

1. to change an illusion or false belief;
   disenchant:
   I hate to disillusion you, but your chances of winning are practically zero.

n. [uncountable]

2. a freeing or a being freed from illusion or conviction;
   disenchantment.

dis•il•lu•sioned, adj.: 

disillusioned voters fed up with politics.

dis•il•lu•sion•ment, n. [uncountable]

WordReference Random House Unabridged Dictionary of American English © 2025

dis•il•lu•sion  (dis′i lo̅o̅′zhən), v.t. 

1. to free from or deprive of illusion, belief, idealism, etc.; disenchant.

n. 

2. a freeing or a being freed from illusion or conviction;
   disenchantment.

• dis-¹ + illusion 1590–1600

dis′il•lu′sion•ment, n. 
dis•il•lu•sive  (dis′i lo̅o̅′siv), adj.  Synonyms

• 1. . disabuse, disenthrall, undeceive, disappoint.

Collins Concise English Dictionary © HarperCollins Publishers::

disillusion / ˌdɪsɪˈluːʒən/ verb

1. (transitive) to destroy the ideals, illusions, or false ideas of
   Also: disillusionize, disillusionise

noun
also: disillusionment

1. the act of disillusioning or the state of being disillusioned