verb (used with object)
to treat badly or abusively.

1425–75; late Middle English mistreten. See mis-1, treat

mistreatment, noun

maltreatment, mistreatment.

maltreat, ill-treat, misuse, wrong.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mistreat (ˌmɪsˈtriːt)
(tr) to treat badly

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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Word Origin & History

mid-15c.; see mis- (1) + treat (v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
What was interesting was how people of one colour could mistreat and harm each
  other instead of working together.
What if they succeeded at taking over and decided to then mistreat you and your
It's not the first, and it's not likely to be the last administration to misuse
  and mistreat science and scientists.
If not, the people who mistreat the prisoners will be treated as war criminals.
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