When it comes to antonyms for the phrase "most dissenting," the options are numerous. Few synonymous words that could be used here include agreeing, conforming, assenting or even going along with. All of these words have a similar meaning. However, if you are looking for antonyms, you could go for words like approving, sanctioning, supporting, or even backing. All of these terms signify the opposite of the phrase "most dissenting." The former represents the act of disagreeing and disapproving, while the latter represents the act of supporting and agreeing with a particular idea or notion. Therefore, while speaking, it's crucial to choose words that communicate your thoughts clearly and accurately.