1. to cause someone to realize that something they believed in is not true or is less good than they thought
Usage: third person singular present tense

1. feelings of disappointment when you discover that something is not as good as you believed it to be
Usage: plural form

Examples

• The scandal disillusions many of his supporters.
• Reality often disillusions young idealists.
• Her disillusions with politics began early in her career.
• The war brought many disillusions about heroism.
• He disillusions himself about his chances of success.
• Their disillusions grew stronger after the failed project.
• The experience disillusions her about human nature.