Megalomaniac – Someone who has an unnaturally strong wish for power and control

To remember the definition of the word megalomaniac, use the following mnemonic:

Shouting through the megaphone at the top of his lungs, this maniac (megalomaniac) had an unnaturally strong wish for power and control.

Examples of megalomaniac in a sentence

When Jess won the beauty pageant, she became an insufferable megalomaniac.

He was definitely a megalomaniac, it was so obvious you could tell without ever speaking a word to him.

The prince was born as a kind and thoughtful boy, but as he grew all the constant attention turned him into a megalomaniac.