megalomaniac

/ˌmɛɡəloʊˈmeɪniæk/

Etymology

By surface analysis, megalomania + -ac, or, by surface analysis, megalo- + -maniac.

adj

  1. Of, exhibiting, or affected with megalomania.“Often, for good measure, Hitler is given as an example of a megalomaniac person. So, for our convenience, Hitler personifies the illness called megalomania[…]”

noun

  1. One affected with or exhibiting megalomania.“'Well, I don't know him well enough yet to say, but I will admit that if he is not a mere bullying megalomaniac, and if what he says is true, then he certainly is in a class by himself.'”