unclean

Definition:

In the Bible, the term "unclean" is used figuratively to refer to things that God declared to be unfit for his people to touch, eat, or sacrifice.

God gave the Israelites instructions about which animals were "clean" and which ones were "unclean." The unclean animals were not permitted to be used for eating or for sacrifice.
People with certain skin diseases were said to be "unclean" until they were healed.
If the Israelites touched something "unclean," they themselves would be considered unclean for a certain period of time.
Obeying God's commands about not touching or eating unclean things kept the Israelites set apart for God's service.
This physical and ritual uncleanness was also symbolic of moral uncleanness.
In another figurative sense, an "unclean spirit" refers to an evil spirit.

The term "unclean" could also be translated as "not clean" or "unfit in God's eyes" or "physically unclean" or "defiled."
When referring to a demon as an unclean spirit, "unclean" could be translated as "evil" or "defiled."
The translation of this term should allow for spiritual uncleanness. It should be able to refer to anything that God declared as unfit for touching, eating, or sacrifice.