Most nonporous means that something is not easily permeable to liquids or gases. It is the opposite of porous, which means that something has small holes or spaces that allow liquids or gases to pass through. Some antonyms for most nonporous include absorbent, permeable, porous, spongy, and absorptive. Materials that are absorbent, like sponges, paper towels, and soft cotton, are perfect for soaking up liquids. Porous materials, such as wood or some fabrics, can allow gases and liquids to pass through easily. Understanding the difference between nonporous and porous materials is important in many fields, including construction, manufacturing, and scientific research.