Most abbreviate means the shortest or most concise form of a word or phrase. Antonyms for the word "most abbreviate" would mean the opposite, or a longer or more extended way to express the same meaning. For example, instead of using the most abbreviate form, you can use the full form of a word or phrase to provide more detail and clarity in your communication. Other antonyms for "most abbreviate" can include expansive, lengthy, prolix, verbose, or wordy. By using antonyms for most abbreviate, you can enhance your writing, increase communication, and fully convey your message.