DictionarypompositySelf-important behavior
noun

pomposity

pahm-PAH-suh-tee/pɑːmˈpɑːsəti/

An exaggerated display of importance or dignity.

The speaker's pomposity makes a simple announcement sound like a royal decree.

At a tiny informal gathering, a conspicuously overdressed woman adopts an inflated ceremonial pose on a low footstool while a casually dressed attendee regards her with raised eyebrows.
Etymology

Latin pomposus described stateliness or pomp. The noun first meant solemnity in English, then shifted toward disapproval of ostentatious dignity and exaggerated self-importance.

In context

Max Derrat4:13
they are going to do so in a very condescending manner. As we move on, I suggest that you, the listener, pay attention to how the A.I. demeans Raiden. Their pomposity is intrinsic to the effectiveness of their future argument.
The Most Profound Moment in Gaming History

More examples

  • She answers his pomposity with a friendly joke.
  • The ceremony's pomposity seems excessive for such a small occasion.
  • Despite his impressive title, he speaks without a trace of pomposity.

Forms

pomposity · pomposities

pompous adjective — Exaggeratedly grand or self-important in manner.

Similar words

pretentiousness
Emphasizes trying to impress others with exaggerated sophistication or merit.
arrogance
Emphasizes a belief in one's superiority, not necessarily grand behavior.