Newman and Stine, A Handbook on the Gospel of Matthew, NY: United Bible Societies, 1988, page 282:

...spirits that make people unfit for worshiping God

Newman and Nida, A Translator's Handbook on the Acts of the Apostles, NY: United Bible Societies, 1972, page 122:

In biblical terminology "evil spirits" and "unclean spirits" are essentially synonymous. There are, however, serious difficulties encountered in employing an adjective such as "unclean," for this can turn out to be simply "dirty." Quite naturally the emphasis in the Bible is on the fact that these spirits caused people to become unclean in a religious sense, that is, they defiled them, so that they could not worship God."

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