Etymology
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mistreatment (n.)

"abuse, wrong or unkind treatment," 1716, from mistreat + -ment. The earlier noun was mistreating (mid-15c.).

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Definitions of mistreatment

mistreatment (n.)
the practice of treating (someone or something) badly;
he should be punished for his mistreatment of his mother
From wordnet.princeton.edu