"巨大痛苦"用英语可以表示为"intense pain"或"severe pain"。

这两个词都有"强烈的"或"严重的"的意思,用来形容痛苦的程度。

例句:

She was in intense pain after the surgery. (她手术后感到巨大的痛苦。)
He suffered from severe pain in his back. (他背部痛苦严重。)

需要注意的是,在英语中,"pain"通常指的是身体的疼痛,而"suffering"则指的是心理上的痛苦。所以如果想要表达心理上的痛苦,可以用"mental suffering"来表达。

例句:

She went through a lot of mental suffering after the divorce. (离婚后她经历了很多心理上的痛苦。)