adjective, uncleaner, uncleanest.
not clean; dirty.
morally impure; evil; vile: unclean thoughts.
Chiefly Biblical. having a physical or moral blemish so as to make impure according to the laws, especially the dietary or ceremonial laws: an unclean animal; unclean persons.

before 900; Middle English unclene, Old English unclǣne. See un-1, clean

uncleanness, noun

1. soiled, filthy. 2. base, unchaste, sinful, corrupt, polluted.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unclean (ʌnˈkliːn)
lacking moral, spiritual, ritual, or physical cleanliness

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

O.E. unclæne, "morally impure, defiled, unfit for food," from un- (1) "not" + clean (adj.). Literal sense of "dirty" is recorded from mid-13c.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
In these bands are all the gamblers, all the adulterers, all the unclean and
  shameless citizens.
The ancestors who produced such an individual are necessarily flawed, for
  nothing unclean can produce something clean.
She knew she should not store unclean clothes in the same room where she kept
  the pictures of her gods.
Unclean hands, however, remains a broader defense less amenable to a particular
  checklist of elements.
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