nonabsorbent

This term describes a material's physical resistance to liquid penetration, creating a barrier that forces fluids to bead up or slide off rather than soaking into the fibers. It is most frequently employed in technical, industrial, or commercial contexts, such as describing waterproof textiles, medical coatings, or specialized cleaning tools.

While similar to waterproof, nonabsorbent specifically emphasizes the lack of internal capacity to hold fluid. A material might be nonabsorbent but still allow liquid to pass through it (like a mesh), whereas waterproof implies a total seal against entry.