unnatural

[uhn-nach-er-uhl, -nach-ruhl]
adjective
1.
contrary to the laws or course of nature.
2.
at variance with the character or nature of a person, animal, or plant.
3.
at variance with what is normal or to be expected: the unnatural atmosphere of the place.
4.
lacking human qualities or sympathies; monstrous; inhuman: an obsessive and unnatural hatred.
5.
not genuine or spontaneous; artificial or contrived: a stiff, unnatural manner.
6.
Obsolete. lacking a valid or natural claim; illegitimate.

Origin:
1375–1425; late Middle English; see un-1, natural

unnaturally, adverb
unnaturalness, noun


3. irregular, aberrant. 4. heartless, brutal.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unnatural (ʌnˈnætʃərəl, -ˈnætʃrəl)
 
adj
1.  contrary to nature; abnormal
2.  not in accordance with accepted standards of behaviour or right and wrong: unnatural love
3.  uncanny; supernatural: unnatural phenomena
4.  affected or forced: an unnatural manner
5.  inhuman or monstrous; wicked: an unnatural crime
6.  obsolete illegitimate
 
un'naturally
 
adv
 
un'naturalness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

unnatural
early 15c., "not in accord with physical nature," from un- (1) "not" + natural. Meaning "artificial" is attested from 1746; that of "at variance with moral standards" is from 1520s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Some birds-blackbirds and nightingales, among others-sing at unnatural hours in
  the presence of artificial light.
There is a false belief that natural selection and unnatural selection work by
  different processes.
The unnatural gloom is believed to have been caused by smoke from forest fires,
  possibly coupled with heavy fog.
Those unnatural postures don't seem to bother the rest of us, though.
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