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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. 2015.
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Word Origin and History for delusional
adj.

1871, from delusion + -al (1).

Online Etymology Dictionary, © 2010 Douglas Harper
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