If I want to describe something and I say it looks amazingly beautiful or it looks amazing beautifully.
What should come first adverb or adjective in this example?
Somebody else will probably be able to give a more comprehensive answer, but the short version is: you can say "beautifully amazing" or "amazingly beautiful", never "amazing beautifully".
The first word I thought of was stunning. Some other words might be remarkable, astonishing, marvelous, phenomenal, splendid, and the list goes on...