Unclean \Un*clean"\, a. [AS. uncl?ne. See Unnot, and Clean.]

1. Not clean; foul; dirty; filthy.

2. Ceremonially impure; needing ritual cleansing.

He that toucheth the dead body of any man shall be unclean seven days. --Num. xix. 11.

3. Morally impure. ``Adultery of the heart, consisting of inordinate and unclean affections.'' --Perkins. -- 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.

Source: Webster's Revised Unabridged Dictionary (1913)