The term "aqueous materials" refers to substances that dissolve in water or are water-based. Some common antonyms for this term are "non-aqueous materials" and "hydrophobic materials." Non-aqueous materials are those that do not dissolve in water and are often used in oil-based products, such as gasoline, oil paints, and non-water-soluble adhesives. Hydrophobic materials, on the other hand, are water-repellent and do not easily mix with water. Some examples of hydrophobic materials include wax, Teflon, and certain types of plastics. Understanding the antonyms of aqueous materials is important in various industrial and scientific fields, such as materials science, chemistry, and environmental engineering.