You've done a grievous thing in bargaining with such a she-devil.
She is saying there were grievous things done to people and, in effect, she is apologizing to the country.
"Because it is a grievous thing for me to meet again those two men who caused the failure of our enterprise."
"A grievous thing when a great man grows old."
We've got many a grave and grievous thing to discuss, not the least of which is who you truly are.
"He will think that this is a grievous thing in your eyes."
Yet it is a very grievous thing to slay old friends.
That danger dissolved, the next necessity became the grievous thing.
Not, however, before her regular demand for her allowance became a grievous thing.
And it was a burden- death was a grievous thing to hand out, when he'd been trained to save lives.