nonabsorbable

This term is primarily used in medical, surgical, and pharmacological contexts to describe materials or substances that the body cannot break down or integrate into its own tissues. It carries a neutral, technical connotation, focusing on the physical property of resistance to absorption. In surgery, it specifically refers to materials like certain sutures that must be manually removed or remain permanently in place because the body cannot dissolve them.

In a nutritional or pharmacological sense, it describes substances that pass through the digestive system without entering the bloodstream. This is often a critical distinction when discussing the bioavailability of a drug or the function of dietary fibers, where the lack of absorption is the intended or defining characteristic of the substance.