(psychology) an erroneous belief that is held in the face of evidence to the contrary

a mistaken or unfounded opinion or idea

the act of deluding; deception by creating illusory ideas

suffering from or characterized by delusions

any mental disorder in which delusions play a significant role

a delusion (common in paranoia) that you are much greater and more powerful and influential than you really are

a delusion (common in paranoia) that others are out to get you and frustrate and embarrass you or inflict suffering on you; a complicated conspiracy is frequently imagined