Pompously

He came in pompously, not knowing that everyone would ridicule him.

When he went home on leave he rioted on a large scale - pompously.

That young man could offer little information, however. The sky, he explained pompously, was a great mystery that only an adept might communicate to another. He meant that he didn't know about it, Dave gathered.

'I could cite good reasons both for and against such a course of action,' he began pompously.