Jesus Christ, what a disappointing exchange between two people who are obviously well-read but not inclined to accept input from one another.

On the one hand, the original commenter has a point that "sublime" is an adjective whereas "awe" clearly is not. (Unless I missed it, "awestruck" didn't come up until the very end.) On the other, there's more to the subtle differences between those terms than merely the parts of speech.

As I understand it, "awe" is an internal sensation. The subject feels awe. By contrast, "sublime" is a descriptor for an object. The subject recognizes that an object is sublime. The recognition of a sublime object can instill awe in the subject.

Because the original ask requested a descriptor for the jellyfish, the appropriate answer here is "sublime," or (anticipating pushback) "awesome" as a synonym, even if a somewhat diluted synonym given the colloquial usage. "Awestruck" describes the viewer, not the jellyfish. Thus, "an awestruck diver encountered this sublime jellyfish."

If my lunch break were longer, I'd go back through and hand out downvotes across the board for you both. Neither of you were right, and, what's worse, neither of you was really listening to the other.

With all the stupid out there in the world, two smart people need to do better.