Definition of impervious

The word "impervious" has a rich history dating back to the 15th century. It comes from the Latin words "im-" (not) and "per-vius" (permeable or penetrable). Initially, the term referred to something that was not capable of being pierced or perforated. Over time, the meaning expanded to include the ability to withstand or resist various forms of attack, such as odors, sounds, or weather conditions. In the 16th century, the term began to be used in everyday language to describe materials that were resistant to water, heat, or other forms of damage. Today, "impervious" is commonly used to describe surfaces or substances that are impermeable to air, water, or other substances. For example, an impervious membrane or an impervious surface can withstand external elements without being damaged or compromised.