Pronunciation: (un-klēn'), [key]
—adj., -er, -est.
1. not clean; dirty.
2. morally impure; evil; vile: unclean thoughts.
3. Chiefly Biblical.having a physical or moral blemish so as to make impure according to the laws, esp. the dietary or ceremonial laws: an unclean animal; unclean persons.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.