Original, Novel, Original Idea
noun, な adjective
Something that has sliced newness into the world is a novel idea. It is original and novel. Just imagine the world as a place of things that are already done. If you want to get something new and novel in there, you have to slice that oldness open to make space for the new.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
I prefer the former idea to the latter because it is a much more original idea.