The antonyms for the word "more aqueous" are "less aqueous," "less watery," "more solid," and "more dry." These words are used to describe substances that have a low water content or are not easily dissolved in water. For instance, a powder or granule is considered "less aqueous" as it is not soluble in water, whereas a liquid, such as juice or milk, is "more aqueous" as it has a high water content. Similarly, a solid material like wood or metal is "more solid," while a liquid like oil or honey is "less solid." These antonyms indicate the opposite properties of substances in terms of their water content or solubility.