bad actor

noun
1.
a mean, ill-tempered, troublemaking, or evil person.
2.
a vicious animal.
3.
an inveterate criminal.

Origin:
1940–45

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Having tests performed by an independent third party might prevent a bad actor
  from gaming the system.
As too many of our enforcement cases demonstrate, even a single bad actor can
  easily cost customers and firms millions of dollars.
There is always the fear that a jury will convict the defendant solely because
  he is a bad actor.
Every time a bad actor produces tainted food, your entire industry suffers.
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