It depends on what you are trying to say. 1. If you are describing the pain as both "unbearable" and "obvious" ("obvious" meaning that the pain obviously existed), then you can say "She looked up at me, her pain obvious and unbearable." It might sound like it was unbearable to the the person who is saying this, though. 2. If you are trying to use "unbearable" to describe "obvious," then you can say "She looked up at me, her pain unbearably obvious." It sounds like it was unbearable to the person that is saying this, though. 3. If you are trying to use "obvious" to describe "unbearable," then you can say "She looked up at me, her pain obviously unbearable." Just so you know, when you use "unbearable," it can sound like it was unbearable to the speaker to see her like that, and not that she was in unbearable pain. "Unbearable" is mostly used when you're talking about your own pain and not someone else's, because you don't know whether or not it's unbearable. Instead, you can use excruciating ("excruciating" is often followed by "pain".) I hope this helped :) Let me know if I didn't explain something well enough!

"unbearably obvious." would be better

She looked up at me sadly, her unbearable pain is obvious.

She looked at me sadly, and her pain was obviously unbearable.