delusion

noun

1.
(psychology) an erroneous belief that is held in the face of evidence to the contrary
psychotic belief
Derived from:
delude delusional
2.
a mistaken or unfounded opinion or idea
shinelock wanhope hallucination
Derived from:
delude delusional
3.
the act of deluding; deception by creating illusory ideas
head game illusion
Derived from:
delude