Definition of uncleansable in English:
uncleansable
(also uncleanseable)
adjective (ˌ)ʌnˈklɛnzəbl(ˌ)ʌŋˈklɛnzəbl
Of a crime, a sense of shame, etc.: that cannot be cleansed or purged. Also in literal sense: impossible to clean.
Origin
Late 15th century; earliest use found in Catholicon Anglicum: an English-Latin wordbook. From un- + cleansable.