pervious

This term describes a physical property of permeability, typically used in scientific, geological, or technical contexts to describe materials like sandstone or certain fabrics. It carries a neutral, descriptive tone and focuses on the capacity of a medium to be penetrated by a fluid or gas.

It is the direct antonym of impervious. While impervious suggests a total barrier or a stubborn resistance, pervious implies a welcoming or open structure that facilitates flow. It is rarely used in casual conversation, appearing instead in engineering reports or environmental studies.