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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delusional is when my friends hollering “ my man” about somebodies who is rlly not they man or saying “ he love meee” when they know that’s a damn lie , but imma stick beside my girls while they try to “ my man my man my man” they way back into they man life .
friend- i miss my man

me- what man , girl you delusional as hell .
by therealestthings June 19, 2023
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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. 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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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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To have a misconception.
Wife: (to rabbit) Sir, will you kindly show us the way to Littleton?
Husband: Um, rabbits don't understand English.

5-year-olds are delusional.
by frabrizio February 3, 2017
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