Definitions

1. adjective

Impossible or difficult to wash, especially because of being heavily soiled or having a special coating.

“The artist used unwashable ink to create the mural, ensuring that it would last for decades.”

2. adjective

Not capable of being made clean or purified, especially due to being morally or spiritually tainted.

“The judge found the defendant’s unwashable past to be a mitigating factor in the sentencing.”