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delusional

[dih-loo-zhuh-nl] /dɪˈlu ʒə nl/
adjective
1.
having false or unrealistic beliefs or opinions:
Senators who think they will get agreement on a comprehensive tax bill are delusional.
2.
Psychiatry. maintaining fixed false beliefs even when confronted with facts, usually as a result of mental illness:
He was so delusional and paranoid that he thought everybody was conspiring against him.
Sometimes, delusionary.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for delusional
Contemporary Examples
Historical Examples
  • The second kind of insanity is called illusional or delusional.

  • But the rapt bard was blinded, as his utterances show, by what now almost appears to have been a fit of delusional insanity.

    The Brothers' War John Calvin Reed
  • She's just traded identities—and everything else she does—everything else—stems logically out of her delusional premise.

    That Sweet Little Old Lady Gordon Randall Garrett (AKA Mark Phillips)
  • In this study Freud shows out of what infantile forms of thought and instincts the delusional system was built up.

  • The "melancholic" is evidently Newington's "delusional" without his more accurate discrimination of symptoms.

    Benign Stupors August Hoch
Word Origin and History for delusional
adj.

1871, from delusion + -al (1).

Online Etymology Dictionary, © 2010 Douglas Harper
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