Untested means not yet tried, examined, or proven through experience. When something is untested, nobody knows for sure whether it will work or how well it will perform because it hasn't been put to the test yet.

A scientist might develop an untested theory that sounds logical but hasn't been proven through experiments. A basketball player might have untested skills if they've practiced shooting but never played in an actual game. A new medicine remains untested until researchers carefully study whether it's safe and effective. Before the Wright brothers flew at Kitty Hawk, powered flight was an untested idea that many people thought was impossible.

Being untested isn't the same as being bad or wrong. It simply means there's no evidence yet, no track record to examine. An untested approach might turn out to be brilliant, or it might fail completely. That's why scientists run experiments, why coaches hold tryouts, and why engineers build prototypes: to take untested ideas and see what happens in reality. The moment you actually test something, it's no longer untested. You gain real information, whether the results are good or disappointing.