I was in a terrible state because nobody could understand why I had this illness.

我极度不安，因为没人能明白我为什么得了这种病。

《柯林斯英汉双解大词典》

Nobody could understand what the problem was.

没有人能想明白发生了什么。

youdao

First, nobody could understand what my music conveyed.

第一，没有能真正听懂我音乐的知音。

youdao

And nobody could understand what the statement said.

NPR: Client Learns Madoff Returns Worthless

Her unease lasted through the introductions of two elderly Russian couples, two elderly Chinese couples, three middle-aged Dominican couples, one handsome young Haitian man, one very tall, very old, and very loud Haitian woman with a funny name Oolna and one dark-skinned woman who spoke so fast and with such a heavy accent that nobody could understand what she said or where she came from.

NEWYORKER: Luda and Milena

The unstated reason was simple: nobody so tainted by traditional business could possibly understand e-commerce in the cyberworld.

FORBES: Malone's Musings