unethical

[uhn-eth-i-kuhl]
adjective
1.
lacking moral principles; unwilling to adhere to proper rules of conduct.
2.
not in accord with the standards of a profession: She treated patients outside the area of her training, and the appropriate medical organization punished her unethical behavior.

Origin:
un-1 + ethical

unethically, adverb
unethicalness, unethicality, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unethical (ʌnˈɛθɪkəl)
 
adj
not ethical; improper: companies involved in unethical practices

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

unethical
1871, from un- (1) "not" + ethical (see ethics).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But critics believe using them is unethical and immoral.
Those who thought they had knock-offs were more likely to say that people were
  dishonest and unethical.
They also served as yet another reminder of how widespread unethical behavior
  remained among the country's power elite.
The concept of asking for free books specifically to re-sell them is extremely
  unethical in my opinion.
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