noun
a person who inflicts severe mental or physical suffering on someone
verb
to cause severe mental or physical suffering to someone
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The tormentor was finally brought to justice after years of causing harm to his victims.
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I can't believe my tormentor from high school just added me on social media.
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That tormentor is such a bully, always picking on smaller kids.
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Fear can be a powerful tormentor, holding us back from reaching our full potential.