Typical mature Mars-like world with minimal atmosphere and hydrosphere
"Fossilized" rock world...early in their history these worlds were marked by geological activity, substantial atmospheres, even the presence of liquid water and primitive life. But, for a variety of reasons, these processes 'atrophied', leaving behind a planet with only signs of its past potential. Life may remain in secluded and protected areas, but it is not a common occurrence. These worlds are the best candidates for successful terraforming.