Someone who is not thinking clearly, or thinks something will happen that, in all likelyhood, will not.
Delusional - Nicholas Bendtner believing he can play for Barcelona or Real Madrid.
by Brisko December 04, 2013

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when someone (usually a woman) has a false or highly exaggerated opinion of themselves.
Lisa thinks she is a princess. She is in fact delusional
by Ronald McD February 10, 2012

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A person who is a Harry/Hermione shipper. They are easily upset, have a limited sense of humour, and do not read particularly well. In their spare time, they like to look for overly used symbolism where none exists. This term was coined by a most wonderful webmaster.
TeenyBopper1892!!: i ship Harry/Hermione. There so kaute and SO canon!!!!1!!!
HeronShipper: A delusional has entered the room, folks.
by Tiffi October 16, 2005

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Believing something to be true that is clearly not. Someone who is not thinking clearly. Used to describe someone attached to an idea which is obviously false.
Jon believes he is always right. He's delusional.
by youreajackass April 16, 2014

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An individual who is given evidence or proof of an event or some doing. And still refusing to believe.
Gary is Delusional. He thinks what he thinks is right, yet he still lies, steals and cheats.
by TrueLanguage June 17, 2015

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So far removed from reality that one fails to think and live in the real world.
You guys are delusional.
by PineappleJuice March 29, 2015

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1)To believe something that is different from the facts.
1) Roberto Martinez is delusional to believe he is a EPL manager.
2) Roberto Martinez is delusional by saying "Over the last three years we (Everton) haven't invested any money." (23 Apr 2016)

The transfer records roughly show an outgoing of £82,630,000 and an incoming of £49,500,000 equating to a expenditure of over £30,000,000.

*Other commonly used words to describe him are "charlatan", "deranged", "arrogant", "stubborn", and "fullofshit".
by RMandBkGTFO May 31, 2016

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