The word "most butyraceous" means the most butter-like or having a high amount of butterfat. Antonyms for this word would include "least oily," "driest," "non-greasy," "low-fat," or "astringent." These words suggest a lack of butterfat or oil, indicating a more dry or lean texture or flavor. Other antonyms might include "chalky," "powdery," or "crumbly," which indicate a texture that is not smooth or creamy. Alternatively, one might consider antonyms that describe a completely different type of texture or flavor, such as "acidic," "spicy," or "sour." Overall, the antonyms for "most butyraceous" suggest a broader range of flavors and textures that are not dominated by butterfat.