unclean
akathartos describes spirits repeatedly expelled or rebuked, and also persons, things, or conduct marked as unclean.
The term most often characterizes spirits that afflict people, are commanded, rebuked, or driven out. It also marks food, people, children, and touchable things as unclean in contrasts with what is holy or acceptable, and it appears of impure persons and things associated with sexual sin.
Senses in use
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Spirits that afflict and are expelled · dominant
In Mark 1:26 the nominative singular neuter form occurs in the clause where the spirit convulses a man, cries out, and comes out of him; the APB renders it "the unclean spirit." In Luke 9:42 the spirit throws down and convulses the child before Jesus rebukes it, while Matthew 10:1 places such spirits under the disciples' authority for expulsion.
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Persons or things treated as unclean · common
Acts 10:14 and Acts 11:8 place the accusative or nominative neuter form in Peter's refusal to eat anything described as common or unclean. Acts 10:28 extends the contrast to a human person, and 2 Corinthians 6:17 uses the genitive singular neuter form in the command not to touch what the APB renders "unclean."
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Impure people or things in sexual contexts · rare
In Ephesians 5:5 the nominative singular masculine form occurs among descriptions of a person who has no inheritance in the kingdom; the APB renders the corresponding description "impure." In Revelation 17:4 the accusative plural neuter form describes things filling the woman's cup in a clause that also mentions her sexual sin.
In the Anselm Project Bible: The APB commonly presents the term as "unclean," especially in phrases such as "unclean spirit" and in descriptions of food or things not to be touched. In Ephesians 5:5 it uses "impure"; because the APB is a whole-verse translation, these English renderings do not establish separate lexical meanings by themselves.