The term "in appurtenant" means relating to or belonging to something as an appendage or accessory. Its antonyms would include "independent", "autonomous", "separate", "isolated", and "disassociated". These words indicate that something is disconnected, detached, or not reliant on anything else. They convey a sense of self-sufficiency and self-reliance, rather than being an integral part of something else. The antonyms of "in appurtenant" emphasize that something is self-contained and can exist on its own, rather than being dependent on or subordinate to another entity. These words reflect a state of being free from constraints and limitations, rather than being bound to something else.