- having false or unrealistic beliefs or opinions: Senators who think they will get agreement on a comprehensive tax bill are delusional.
- 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.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for delusional
At one point they even told her she was delusional, despite her diffuse ulcerating lesions.Why Your Doctor Feels Like a 'Beaten Dog'
September 11, 2014
I suppose you can if you were dumb and delusional enough to think that the Emmy voters might liven things up a little bit.The Biggest Emmys Snubs and Surprises: 'Modern Family,' McConaughey, and More
August 26, 2014
But according expert opinion and the case details released to the public, she was also floridly psychotic and delusional.Postpartum Stigma: Why My Patient Committed Suicide
August 5, 2014
Burke insists that he is not nostalgic and he is not delusional.James Lee Burke Talks About His Fiction, History, and the American Dream
July 20, 2014
And delusional thinking can lead to irrational, dangerous behavior.One Breakdown Can Mean Losing Your Kid Forever
May 30, 2014
The second kind of insanity is called illusional or delusional.Moral Principles and Medical Practice
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
Word Origin and History for delusional
Online Etymology Dictionary, © 2010 Douglas Harper