The word is: legit. And no exaggeration, I genuinely think she may change how the game is played on both tours.
Most tennis players fit into a game style: attacker, counterpuncher, retriever, finesse player, junkballer, etc.
I've never before seen a player literally play every one of those styles within a single point.
Federer may come the closest to doing that, but not nearly as often as she does. And damn does it work. Its unpredictability seems to really throw off her opponents, and she seems to do it instinctually rather than looking like she's just trying sh-t.
Reminds me of a five or six pitch pitcher, and damn is she talented as well as mentally tough.