The Collaborative International Dictionary
Unclean \Un*clean"\, a. [AS. uncl?ne. See Unnot, and Clean.]
Not clean; foul; dirty; filthy.
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Ceremonially impure; needing ritual cleansing.
He that toucheth the dead body of any man shall be unclean seven days.
--Num. xix. 11. -
Morally impure. ``Adultery of the heart, consisting of inordinate and unclean affections.''
--Perkins. [1913 Webster] -- Un*clean"ly, adv. -- Un*clean"ness, n.Unclean animals (Script.), those which the Israelites were forbidden to use for food.
Unclean spirit (Script.), a wicked spirit; a demon.
--Mark i. 27.
Usage examples of "unclean animals".
Then you compare them to unclean animals and you accuse them of plotting against you.
And after they had eaten all the bird carcasses and all the unclean animals they could find, there was a rumor in the village that somebody was beginning to dig up the dead.
It is possible that the Priestly writer does not include the distinction between clean and unclean animals, nor the mention of sacrifices, in his account because he regards these institutions as originating in the time of Moses.