jackanapes

That accomplished, I shall arrest the Dowager and her son and every jackanapes within that castle.

You pestilent young jackanapes, do you suppose I haven't noticed your idleness?

"Lest he take thee for one of his runaway jackanapes," answered the steward, smiling sourly.

In another letter he writes about "a jackanapes who has lately made a noise here, one Boswell, by anecdotes of Dr. Johnson."

No, Mr. Harry Jocelyn, you are not the jackanapes you try to make people think you: you understand me.'