agony的形容词是agonizing，adj. 苦恼的痛苦难忍的

He now faced an agonizing decision about his immediate future.他现在面临着一项关系到他不久的将来的痛苦抉择。

I spent days agonizing over whether to take the job or not.

我用了好些天苦苦思考是否接受这个工作。