noun
a person who behaves in a harmful or dishonest way, especially in a play, movie, or television show
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The company has strict policies in place to prevent any bad actor from causing harm.
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We need to watch out for any bad actor trying to sabotage our project.
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Don't trust that guy, he's a total bad actor.
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In the world of politics, it's important to be able to identify a bad actor when you see one.