五里雾中 (wǔ lǐ wù zhōng): To be completely confused or bewildered — Meaning & Stroke Order

The new employee is still in the dark about the company's procedures and needs time to adapt.

His speech was so illogical that the audience was completely bewildered.

Faced with this complex math problem, he felt completely lost and didn't know where to start.

When I first started learning classical Chinese, I was often in a fog and didn't understand the meaning.