delusional

[dih-loo-zhuh-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.
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World English Dictionary
delusion (dɪˈluːʒən)
 
n
1.  a mistaken or misleading opinion, idea, belief, etc: he has delusions of grandeur
2.  psychiatry illusion See also hallucination a belief held in the face of evidence to the contrary, that is resistant to all reason
3.  the act of deluding or state of being deluded
 
de'lusional
 
adj
 
de'lusive
 
adj
 
de'lusively
 
adv
 
de'lusiveness
 
n
 
delusory
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

delusional
1871, from delusion + -al (1).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
You're either very good at self-satire, or delusional.
We were dripping wet, delusional from lack of sleep, and just wishing that our
  trip wasn't about to end.
Some experts are so out of touch with reality, they're borderline delusional.
But if anybody was delusional last season, it was the producers.
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