unclean
adj.dirty or not pure. You use this to describe something that needs washing or something that is not allowed for religious reasons.
adj.soiled or contaminated; not clean. In a religious or ritual context, refers to being spiritually impure or prohibited by law.
“The kitchen floor was unclean after the party.”
“The health inspector closed the restaurant because the food preparation surfaces were found to be unclean.”
“In many ancient cultures, certain animals were considered unclean and could not be eaten or touched without undergoing a ritual purification process.”
Often used in a literal sense for physical dirt, but carries a stronger, more formal or moral weight than the word 'dirty'.
From Middle English unclene, from Old English unclǣne, equivalent to un- + clean.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.