The antonyms for the word "un-discoverable" are numerous, as there are many ways to describe something that is easily found or known. Some examples include "discoverable," "accessible," "visible," "clear," "obvious," "apparent," "detectable," "perceptible," "exposed," and "evident." These words all suggest that something is easy to find, locate, or understand, and they stand in sharp contrast to the idea of something that is hidden, unknown, or mysterious. Whether you are talking about a hidden treasure or a long-lost artifact, the antonyms for "un-discoverable" can help you describe a wide range of things that are easy to find and understand.