Outright refuse
From Lord Of Utterdom
"I will not be a lackey!" You exclaim. "You have men better suited to this task than I!"
"I suggest you do as you are told."
"No," you say, taking a step back.
"Then," the King says, his face angry and red, "you will pack your things and leave the castle at once. If you have no interest in the running of the kingdom or in earning your place amongst our lineage, you will go out and make your own way."
He points off towards the door, eyes glaring at you.