- that cannot be spotted or stained, as garments.
- that cannot be morally reprehensible: an unstainable person.
Origin of unstainable
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for unstainable
Historical Examples of unstainable
For some time the manufacturer triumphed, and it became known that Hart's red 'Angel-backs' were unstainable.
It was said to be untarnishable and unstainable even when used with the strongest acid foods, as well as non-rusting.