Megalomaniac has a negative tone and suggests harmful levels of ambition or control. The CEO's megalomaniac plans worried the board.
Pro Tip 2/3
Not Clinical
Though it sounds clinical, it's typically used in informal contexts to criticize someone's behavior. Stop being a megalomaniac and listen to our team's ideas.
Pro Tip 3/3
Power Abuse
Megalomaniac is often used when someone abuses their power, not just desires it. The manager's megalomaniac actions led to a staff revolt.