Someone who is not thinking clearly, or thinks something will happen that, in all likelyhood, will not.
by Brisko December 4, 2013

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
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
by J.Wil888 February 4, 2009

Used to describe someone attached to an idea which is either false, or has changed. An alternative to "living in the past."
1. James still thinks we live in a democracy. He's delusional.
2. Paul listens to the Bee Gees and drives a Trans Am. He's delusional on the 70s, man.
2. Paul listens to the Bee Gees and drives a Trans Am. He's delusional on the 70s, man.
by Col. Dr. May 4, 2006

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".
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

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.
Husband: Um, rabbits don't understand English.
5-year-olds are delusional.
by frabrizio February 2, 2017

1. The state of having a false opinion or belief.
2. Used to describe someone attached, possibly obbsessed, with an idea which is either false, or has changed. Synonymous to "living in the past."
2. Used to describe someone attached, possibly obbsessed, with an idea which is either false, or has changed. Synonymous to "living in the past."
Shannon really thinks she could get him back even though its clear there is no way of that EVER happening?!... She's delusional.
by MeowMeoow October 15, 2010

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
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
