delusion

[ US /dɪˈɫuʒən/ ]
[ UK /dɪlˈuːʒən/ ]

NOUN

a mistaken or unfounded opinion or idea
he has delusions of competence
his dreams of vast wealth are a hallucination
the act of deluding; deception by creating illusory ideas
(psychology) an erroneous belief that is held in the face of evidence to the contrary

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How To Use delusion In A Sentence

She regarded him as a somewhat crazy and delusional man, no matter how good he looked.
But there was an element of delusion, mild trickery even, about this process.
On two consecutive nights of Hardball, Chris Matthews brought up this same trio as examples of Gore's "delusionary" thinking. Going After Gore
After light's term, a term of cecity: the best hope for the future, that light will return and banish the follies, sophistries, delusions, which have accumulated in the darkness. Matthew Arnold
Is this for real, or just a delusion on my part?
He remains an eloquent and witty portrait of self-delusion.
It is my conviction , or my delusion , that crime brings its own fatality with it.
In some non-Western cultures, schizophrenic delusions single out the person as spiritually gifted.
The study cites evidence that such isolation can produce “the most extreme forms of psychopathology, such as depersonalization, hallucination, and delusions.” Primary Sources
She wants to travel first - class: she must have delusions of grandeur.