The condition you might be referring to is known as "hubris syndrome." Hubris syndrome is not officially recognized as a psychiatric disorder but is a term used to describe a set of personality traits and behaviors in individuals in positions of power or authority who develop an exaggerated sense of self-confidence, self-importance, and an overwhelming belief that they have all the answers and are always right.
Hubris syndrome can manifest in leaders or people in influential positions, causing them to become overconfident, arrogant, and unwilling to accept criticism or differing opinions. This can lead to significant decision-making errors and a lack of consideration for the potential consequences of their actions.
It's essential to note that hubris syndrome is more of a descriptive concept than a formally recognized medical condition like narcissistic personality disorder (NPD). NPD is a personality disorder characterized by a pattern of grandiosity, a need for admiration, and a lack of empathy, whereas hubris syndrome is a broader characterization of excessive self-confidence and arrogance seen in certain individuals in powerful roles.