characterized by arrogance or over-elaborateness
pompous - arrogant
A person described as ‘pompous’ is very serious and full of self-importance. As such, they often behave or speak in an ornate or self-aggrandizing manner, and believe that they are better than others. The term is typically used as an insult.
Peter causes friction because he often comes across as being very pompous when he’s giving instructions.
The politician’s speech was full of pompous rhetoric designed to make him seem important and knowledgeable.
I’ve had enough of her pomposity! She thinks she is so much better than everybody else.