Medically reviewed by Kira Graves, PhD Delusions of grandeur are false beliefs in which people think they are God-like, powerful, or invincible.A person with grandiose delusions can be angry and ...

A delusion is a fixed, relatively immutable, persistent, false belief with no basis in reality. Source: Piotr Marcinski/Shutterstock We talk often about "deluded" people: “The person on the talent ...