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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Someone who is not thinking clearly, or thinks something will happen that, in all likelyhood, will not.
guy1: So I'm thinking of asking Leah out. I think she might say yes.
guy2: Ummm, are you delusional or something?
by bandcampgirl183 September 13, 2005
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1. the state of having a false opinion or belief

2. H/Hr shippers
Idiot: Harry and Hermione are like sooooo meant to be together...

Me: You're incredibly delusional... If you could read you would realise Ron and Hermione have amazing amounts of sexual tension...
by msweasley June 5, 2007
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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 April 23, 2016
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adj.
1. Someone who believes only their way, and everyone else is wrong.

2. Someone who is obsessed or stuck on one false belief and ignorantly denies logic and reasoning.

3. A derogatory term that Atheists use to describe Christians and other religious people.

4. paranoid
The Preacher shunned the homosexual because he was delusional.
by J.Wil888 February 3, 2009
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An insult/label often flung at those who have beliefs that are not commonly accepted.
Person 1: I believe aliens are visiting Earth.

Person 2: OMG UR DELUSIONAL

Person 1: No I am not, I've thought about the issue thoroughly

Person 2: DELUSIONAL DELUSIONAL DELUSIONAL IM GONNA HAV U LOKD UP
by Shadow Creator March 21, 2008
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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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