delusion

noun
de*lu*sion \ di-ˈlü-zhən \ dē- \
15th century{ds||2||}
  • something that is falsely or delusively believed or propagated
  • a persistent false psychotic belief regarding the self or persons or objects outside the self that is maintained despite indisputable evidence to the contrary; also : the abnormal state marked by such beliefs
  • the act of tricking or deceiving someone : the state of being deluded

self-delusion

noun
self-de*lu*sion \ ˌself-di-ˈlü-zhən \ -dē- \
1625{ds||1||}
  • the act of deluding oneself or the state of being deluded by oneself especially concerning one's true nature, abilities, feelings, etc.
  • a delusion that one has concerning oneself

labor under a delusion/misapprehension/misconception

idiom
labor under a delusion/misapprehension/misconception \
  • to continue to believe something that is not true
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