The word "come-at-able" refers to something that is easily accessible or available. Its antonyms are words that describe things that are difficult to reach or obtain. Some examples of antonyms for "come-at-able" are inaccessible, unattainable, out of reach, remote, and unobtainable. These words signify something that is either too far away physically, or too challenging to achieve or acquire.
Using these antonyms can help to convey a sense of distance, challenge, or inaccessibility. They can be particularly useful when describing a situation or object that is desirable, but not easily attainable. So, if you're looking for the opposite of "come-at-able," consider using one of these antonyms to add depth and complexity to your writing.