If you describe something as excruciating, you are emphasizing that it is extremely painful, either physically or emotionally.
例句
I was in excruciating pain and one leg wouldn't move...我忍受着剧痛，一条腿无法动弹。Her search for love has often caused her excruciating misery and loneliness.她对爱情的寻觅常常给她带来极大的痛苦和孤独感。
ADJ-GRADED
难以忍受的;令人苦恼的
If you describe something as excruciating, you mean that it is very unpleasant to experience, for example because it is very boring or embarrassing.
例句
Meanwhile, the boredom is excruciating...同时，又无聊得让人苦恼不已。There was a moment of excruciating silence.一时间安静得令人难以忍受。