The word "more sureenough" is not a commonly used term or word in the English language. Therefore, it doesn't have any antonyms. However, if we break down the word into its two parts, "more" and "sureenough," we can find antonyms for each word. The antonym for "more" could be "less," while the antonym for "sureenough" could be "uncertain" or "doubtful." Therefore, if we put those antonyms together, we could say that the antonyms for "more sureenough" might be "less uncertain" or "less doubtful." It's important to note that this phrase doesn't have a clear meaning or context, which makes finding suitable antonyms difficult.