Is this natural?

Yes

In the sentence is crouched an adjective? Would you have written it exactly like this or is there a better word?
thank you

In the sentence is crouched an adjective? Maybe. Or maybe an adverb here.

Would you have written it exactly like this or is there a better word? It depends on the context.

Here is the context:
Therer are security guards doing their rounds I you are trying to get across the yard unnoticed and you cross crouched.
How would you have written it?


I crossed the yard crouched so people wouldn't see me.

Thanks

What you wrote is OK.