Agonized is how a face, a voice, or a body looks when the pain is very, very bad — not a small “ouch,” but pain a person can hardly bear. You will meet it more in stories and news than in easy chat: an agonized cry, an agonized expression, agonized screams. People also use it for pain in the mind, not only the body; a parent waiting for news can wear an agonized look. The same spelling is the past of the verb agonize: “she agonized over the choice” means she worried and turned the problem over and over. That use is quieter and quite common in writing. The form agonized is American; British English often writes agonised. The word feels a little heavy and dramatic. In everyday talk, people more often say someone looked like they were in a lot of pain.