The word "un-viewable" refers to something that cannot be viewed or seen. Some of the antonyms for this word include "viewable," "visible," "observable," "apparent," "noticeable," "perceivable," and "detectable." These words all express the opposite meaning of "un-viewable" and suggest that something is easily seen, noticed, or detected. Additionally, words such as "transparent," "clear," and "legible" can also be used as antonyms for "un-viewable" since they imply that something is easy to see, read, or comprehend. Overall, using antonyms for "un-viewable" can help us better describe the accessibility and visibility of certain things.