agony
"Agony" is from the Greek "agon" which means "struggle" and can be seen in the words "protagonist" and "antagonist." Usually, a protagonist is agonized because of a struggle with a specific antagonist. Here, Jonas is struggling with the pain of a memory of a broken leg. The antagonists that cause Jonas agony are not identifiable humans he can fight; rather, they are the world's memories of the past and his present community's attitudes and approaches towards life.
In his agony he perceived the word “fire” and felt flames licking at the torn bone and flesh.
writhe
Then, suddenly, he was in the Annex room again, writhing on the bed.
linger
But this ache lingered.
unendurable
It was not unendurable, as the pain on the hill had been.
forsake
Again and again he dreamed of the anguish and the isolation on the forsaken hill.
assuage
It was not enough to assuage the pain that Jonas was beginning, now, to know.
ominous
Now it was ominous. It meant, he knew, that nothing could be changed.
immobilize
One of Jonas’s arms was immobilized with pain, and he could see through his own torn sleeve something that looked like ragged flesh and splintery bone.
permeate
And his new, heightened feelings permeated a greater realm than simply his sleep.
dejected
“Me,” Jonas said in a dejected voice. He was not looking forward to the end of the training, when he would become the new Receiver. It was clear to him what a terribly difficult and lonely life it was, despite the honor.