The antonyms for the word "most abridged" would be "unabridged," "expanded," or "complete." A work that is unabridged is one that has not been shortened or condensed, and includes all the original content. An expanded work, on the other hand, may include additional material beyond the original text. A complete work would also have all the content, but may not necessarily include any additional material. These antonyms are all useful in different contexts, depending on whether the goal is to preserve the original content, provide more context or analysis, or simply to have a complete version of the work.